U.S. World War II veterans are accompanied by U.S. soldiers in Sainte-Mere-Eglise on the Normandy coast, in northern France, June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history June 6, 1944 to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Regis Duvignau (FRANCE - Tags: CONFLICT ANNIVERSARY)

Britain's Prince Charles (2nd L) meets veterans of the Normandy campaign, at the Pegasus bridge crossing in Benouville, northern France June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the Normandy coastline where Allied forces landed in the largest seaborne invasion in history 70 years ago to help speed up the defeat of Nazi Germany in the Second World War. REUTERS/Leon Neal/Pool (FRANCE - Tags: POLITICS ANNIVERSARY CONFLICT ROYALS TPX IMAGES OF THE DAY) 

Britain's Prince Charles boards a Word War II powerboat during a D-Day commemoration event at the Pegasus bridge, northern France June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the Normandy coastline where Allied forces landed in the largest seaborne invasion in history seventy years ago to help speed up the defeat of Nazi Germany in the Second World War. REUTERS/Leon Neal/Pool (FRANCE - Tags: POLITICS ANNIVERSARY CONFLICT ROYALS)

British D-Day veterans, all from Wiltshire (L to R), Wally Ball, Doug Blakey, Bernie Howell, Bob Corney, George French, Gordon Smith and and Albert William stand on Sword Beach at Hermanville-sur-Mer on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Toby Melville (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS) 

Signal Warfare officer Ronny Amaya gestures on the launching deck of U.S. Navy cruiser Vella Gulf in the Black Sea port of Constanta June 5, 2014. U.S. Defence Secretary Chuck Hagel visited the U.S. Navy cruiser Vella Gulf on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. The United States will strengthen its presence in the Black Sea region using part of a $1 billion fund promised to NATO allies on Russia's borders, and will continue to send warships to the area, Defence Secretary Chuck Hagel said in Romania on Thursday. REUTERS/Bogdan Cristel (ROMANIA - Tags: ANNIVERSARY MILITARY POLITICS MARITIME) 

History enthusiasts wearing WW2 U.S. military uniforms re-enact a D-DAY landing on Omaha Beach in Vierville sur Mer, on Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history June 6, 1944 to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Pascal Rossignol (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS)

Signal Warfare officer Ronny Amaya walks on the deck of U.S. Navy cruiser Vella Gulf in the Black Sea port of Constanta June 5, 2014. U.S. Defence Secretary Chuck Hagel visited the U.S. Navy cruiser Vella Gulf on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. The United States will strengthen its presence in the Black Sea region using part of a $1 billion fund promised to NATO allies on Russia's borders, and will continue to send warships to the area, Defence Secretary Chuck Hagel said in Romania on Thursday. REUTERS/Bogdan Cristel (ROMANIA - Tags: ANNIVERSARY MILITARY POLITICS MARITIME) 

British D-Day veterans, all from Wiltshire (L to R), Wally Ball, Doug Blakey, Bernie Howell, Bob Corney, George French, Gordon Smith and and Albert William stand on Sword Beach at Hermanville-sur-Mer on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Toby Melville (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS) 

Crew members talk on the deck of U.S. Navy cruiser Vella Gulf in the Black Sea port of Constanta June 5, 2014. U.S. Defence Secretary Chuck Hagel visited the U.S. Navy cruiser Vella Gulf on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. The United States will strengthen its presence in the Black Sea region using part of a $1 billion fund promised to NATO allies on Russia's borders, and will continue to send warships to the area, Defence Secretary Chuck Hagel said in Romania on Thursday. REUTERS/Bogdan Cristel (ROMANIA - Tags: ANNIVERSARY MILITARY POLITICS MARITIME) 

A crew member stands on the deck of U.S. Navy cruiser Vella Gulf in the Black Sea port of Constanta June 5, 2014. U.S. Defence Secretary Chuck Hagel visited the U.S. Navy cruiser Vella Gulf on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. The United States will strengthen its presence in the Black Sea region using part of a $1 billion fund promised to NATO allies on Russia's borders, and will continue to send warships to the area, Defence Secretary Chuck Hagel said in Romania on Thursday. REUTERS/Bogdan Cristel (ROMANIA - Tags: ANNIVERSARY MILITARY POLITICS MARITIME) 

A dog sits near a history enthusiast wearing U.S. military uniform during a re-enactment of D-DAY landing on Omaha Beach in Vierville sur Mer, on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history June 6, 1944 to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Pascal Rossignol (FRANCE - Tags: ANIMALS POLITICS ANNIVERSARY CONFLICT)

History enthusiasts wearing WW2 U.S. military uniforms re-enact a D-Day landing on Omaha Beach in Vierville-sur-Mer, on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history June 6, 1944 to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Pascal Rossignol (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS)

A view from the navigation room of U.S. Navy cruiser Vella Gulf is seen in the Black Sea port of Constanta June 5, 2014. U.S. Defence Secretary Chuck Hagel visited the U.S. cruiser Vella Gulf on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. The United States will strengthen its presence in the Black Sea region using part of a $1 billion fund promised to NATO allies on Russia's borders, and will continue to send warships to the area, Defence Secretary Chuck Hagel said in Romania on Thursday. REUTERS/Bogdan Cristel (ROMANIA - Tags: ANNIVERSARY MILITARY POLITICS MARITIME) 

History enthusiasts wearing WW2 U.S. military uniforms re-enact a D-Day landing on Omaha Beach in Viervill-sur-Mer, on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history June 6, 1944 to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Pascal Rossignol (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS)

A view of U.S. Navy cruiser Vella Gulf in the Black Sea port of Constanta June 5, 2014. U.S. Defence Secretary Chuck Hagel visited the U.S. Navy cruiser Vella Gulf on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. The United States will strengthen its presence in the Black Sea region using part of a $1 billion fund promised to NATO allies on Russia's borders, and will continue to send warships to the area, Defence Secretary Chuck Hagel said in Romania on Thursday. REUTERS/Bogdan Cristel (ROMANIA - Tags: ANNIVERSARY MILITARY POLITICS MARITIME CONFLICT) 

History enthusiasts wearing WW2 U.S. military uniforms are reflected in the water as they re-enact a D-Day landing on Omaha Beach in Vierville-sur-Mer, on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history June 6, 1944 to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Pascal Rossignol (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS)

History enthusiasts wearing WW2 U.S. military uniforms re-enact a D-Day landing on Omaha Beach in Vierville-sur-Mer, on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history June 6, 1944 to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Pascal Rossignol (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS)

History enthusiasts wearing WW2 U.S. military uniforms re-enact a D-Day landing on Omaha Beach in Vierville-sur-Mer, on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history June 6, 1944 to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Pascal Rossignol (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS)

A history enthusiast wearing U.S. military uniform re-enacts a D-Day landing on Omaha Beach in Vierville-sur-Mer, on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history June 6, 1944 to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Pascal Rossignol (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS)

A history enthusiast wearing U.S. military uniform re-enacts a D-Day landing on Omaha Beach in Vierville-sur-Mer, on the Normandy coast June 5, 2014.Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history June 6, 1944 to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Pascal Rossignol (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS)

British D-Day veteran, David Cottrell, 89, (L) from Bristol who served in the Royal Navy looks out on Sword Beach as a child plays at Hermanville-sur-Mer on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Toby Melville (FRANCE - Tags: CONFLICT ANNIVERSARY) 

A British D-Day veteran (L) listens during a commemoration ceremony and parade by members of the British Army 3rd Division at Hermanville-sur-Mer on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Toby Melville (FRANCE) 

Britain's Prince Charles (L) meets veterans of the Normandy campaign, at the Pegasus bridge crossing in Benouville, northern France June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the Normandy coastline where Allied forces landed in the largest seaborne invasion in history seventy years ago to help speed up the defeat of Nazi Germany in the Second World War. REUTERS/Remy de la Mauviniere/Pool (FRANCE - Tags: POLITICS ANNIVERSARY CONFLICT ROYALS)

British D-Day veterans, all from Wiltshire (L to R), Wally Ball, Doug Blakey, Bernie Howell, Bob Corney, George French, Gordon Smith and and Albert William stand on Sword Beach at Hermanville-sur-Mer on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Toby Melville (FRANCE - Tags: CONFLICT ANNIVERSARY) 

Britain's Prince Charles (L) meets veterans of the Normandy campaign, at the Pegasus bridge crossing in Benouville, northern France June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the Normandy coastline where Allied forces landed in the largest seaborne invasion in history seventy years ago to help speed up the defeat of Nazi Germany in the Second World War. REUTERS/Leon Neal/Pool (FRANCE - Tags: POLITICS ANNIVERSARY CONFLICT ROYALS)

British D-Day veteran, Gordon Smith, 90, from Wiltshire, walks on Sword Beach at Hermanville-sur-Mer on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Toby Melville (FRANCE - Tags: CONFLICT ANNIVERSARY) 

British D-Day veterans attend a commemoration ceremony and parade by members of the British Army 3rd Division at Hermanville-sur-Mer on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Toby Melville (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS) 

A British D-Day veteran listens during a commemoration ceremony and parade by members of the British Army 3rd Division at Hermanville-sur-Mer on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Toby Melville (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS) 

A British D-Day veteran reacts during a commemoration ceremony and parade by members of the British Army 3rd Division at Hermanville-sur-Mer on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Toby Melville (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS) 

Crew members talk on the deck of U.S. cruiser Vella Gulf in the Black Sea port of Constanta June 5, 2014. U.S. Defence Secretary Chuck Hagel visited the U.S. cruiser Vella Gulf on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. The United States will strengthen its presence in the Black Sea region using part of a $1 billion fund promised to NATO allies on Russia's borders, and will continue to send warships to the area, Defence Secretary Chuck Hagel said in Romania on Thursday. REUTERS/Bogdan Cristel (ROMANIA - Tags: MILITARY POLITICS) 

Relatives watch as British D-Day veteran, Gordon Smith, 90, from Wiltshire, walks on Sword Beach at Hermanville-sur-Mer on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Toby Melville (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS TPX IMAGES OF THE DAY) 

View of the launching deck of U.S. cruiser Vella Gulf in the Black Sea port of Constanta June 5, 2014. U.S. Defence Secretary Chuck Hagel visited the U.S. cruiser Vella Gulf on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. The United States will strengthen its presence in the Black Sea region using part of a $1 billion fund promised to NATO allies on Russia's borders, and will continue to send warships to the area, Defence Secretary Chuck Hagel said in Romania on Thursday. Hagel is the latest high-ranking American official to visit Europe since Russia's annexation of Crimea, as Washington looks to reassure allies jittery about Moscow's intentions in its former Cold War backyard. REUTERS/Bogdan Cristel (ROMANIA - Tags: MILITARY POLITICS) 

British D-Day veteran Jim Kelly, 91, who served in the Royal Marines, listens during a commemoration ceremony at Hermanville-sur-Mer on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Toby Melville (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS) 

Signal Warfare officer Ronny Amaya gestures on the deck of U.S. cruiser Vella Gulf in the Black Sea port of Constanta June 5, 2014. U.S. Defence Secretary Chuck Hagel visited the U.S. cruiser Vella Gulf on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. The United States will strengthen its presence in the Black Sea region using part of a $1 billion fund promised to NATO allies on Russia's borders, and will continue to send warships to the area, Defence Secretary Chuck Hagel said in Romania on Thursday. Hagel is the latest high-ranking American official to visit Europe since Russia's annexation of Crimea, as Washington looks to reassure allies jittery about Moscow's intentions in its former Cold War backyard.REUTERS/Bogdan Cristel (ROMANIA - Tags: MILITARY POLITICS) 

British D-Day veteran, George French, 88, from Wiltshire, who served with King's Royal Rifles looks out to the water as he stands on Sword Beach at Hermanville-sur-Mer on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Toby Melville (FRANCEC) 

British D-Day veteran, George French, 88, from Wiltshire, who served with King's Royal Rifles walks on Sword Beach at Hermanville-sur-Mer on the Normandy coast June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Toby Melville (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS) 

History enthusiasts wearing World War Two U.S. military uniforms re-enact a D-Day landing on Omaha Beach in Vierville sur Mer, on the coast of Normandy June 5, 2014. REUTERS/Pascal Rossignol (FRANCE - Tags: CONFLICT ANNIVERSARY TPX IMAGES OF THE DAY) 

U.S. Defence Secretary Chuck Hagel (L) and Romania's Defence Minister Mircea Dusa attend a joint media briefing in the Black Sea port of Constanta June 5, 2014. Hagel visited the U.S. cruiser Vella Gulf on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. The United States will strengthen its presence in the Black Sea region using part of a $1 billion fund promised to NATO allies on Russia's borders, and will continue to send warships to the area, Hagel said in Romania on Thursday. Hagel is the latest high-ranking American official to visit Europe since Russia's annexation of Crimea, as Washington looks to reassure allies jittery about Moscow's intentions in its former Cold War backyard. REUTERS/Bogdan Cristel (ROMANIA - Tags: MILITARY POLITICS) 

Britain's Prince Charles (R) crosses the rebuilt Pegasus bridge with his wife Camilla, Duchess of Cornwall, in Benouville, northern France June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the Normandy coastline where Allied forces landed in the largest seaborne invasion in history seventy years ago to help speed up the defeat of Nazi Germany in the Second World War. REUTERS/Chris Helgren (FRANCE - Tags: POLITICS ANNIVERSARY CONFLICT ROYALS TPX IMAGES OF THE DAY) 

Britain's Prince Charles (L) meets veterans of the Normandy campaign, at the Pegasus bridge crossing in Benouville, northern France June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the Normandy coastline where Allied forces landed in the largest seaborne invasion in history seventy years ago to help speed up the defeat of Nazi Germany in the Second World War. REUTERS/Chris Helgren (FRANCE - Tags: POLITICS ANNIVERSARY CONFLICT ROYALS) 

Britain's Prince Charles (L) meets veterans of the Normandy campaign, at the Pegasus bridge crossing in Benouville, northern France June 5, 2014. Some 3,000 veterans are among those attending ceremonies across the Normandy coastline where Allied forces landed in the largest seaborne invasion in history seventy years ago to help speed up the defeat of Nazi Germany in the Second World War. REUTERS/Chris Helgren (FRANCE - Tags: POLITICS ANNIVERSARY CONFLICT ROYALS TPX IMAGES OF THE DAY) 

A paratrooper lands on Sword Beach near international flags during a D-Day celebration rehearsal in Ouistreham, on the Normandy coast June 5, 2014. Some 18 heads of state will attend ceremonies bringing together 3,000 veterans in Normandy where Allied forces landed on June 6, 1944 in a seaborne invasion that sped up the defeat of Nazi Germany in World War Two. REUTERS/Christian Hartmann (FRANCECONFLICT ANNIVERSARY - Tags: ANNIVERSARY CONFLICT MILITARY) 

U.S. Defence Secretary Chuck Hagel addresses a joint media briefing with Romania's Defence Minister Mircea Dusa in the Black Sea port of Constanta June 5, 2014. Hagel visited the U.S. cruiser Vella Gulf on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. REUTERS/Bogdan Cristel (ROMANIA - Tags: MILITARY POLITICS) 

A crew member stands on the deck of U.S. cruiser Vella Gulf in the Black Sea port of Constanta June 5, 2014. U.S. Defence Secretary Chuck Hagel will visit the U.S. cruiser Vella Gulf on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. REUTERS/Bogdan Cristel (ROMANIA - Tags: MILITARY POLITICS) 

Romanian soldiers stand in attention during the welcoming ceremony for U.S. Defence Secretary Chuck Hagel in the Black Sea port of Constanta June 5, 2014. Hagel will visit the U.S. cruiser Vella Gulf on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. REUTERS/Bogdan Cristel (ROMANIA - Tags: MILITARY POLITICS) 

Romanian soldiers march in front USS Vella Gulf during the welcoming ceremony for U.S. Defence Secretary Chuck Hagel, in the Black Sea port of Constanta June 5, 2014. Hagel will visit the cruiser Vella Gulf, which is on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. REUTERS/Bogdan Cristel (ROMANIA - Tags: MILITARY POLITICS) 

A crew member boards U.S. cruiser Vella Gulf in the Black Sea port of Constanta June 5, 2014. U.S. Defence Secretary Chuck Hagel will visit the Vella Gulf on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. REUTERS/Bogdan Cristel (ROMANIA - Tags: MILITARY POLITICS) 

Romanian soldiers stand in front USS Vella Gulf during the welcoming ceremony for U.S. Defence Secretary Chuck Hagel, in the Black Sea port of Constanta June 5, 2014. Hagel will visit the cruiser Vella Gulf, which is on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. REUTERS/Bogdan Cristel (ROMANIA - Tags: MILITARY POLITICS) 

Romanian soldiers look out from a bus after the welcoming ceremony for U.S. Defence Secretary Chuck Hagel in the Black Sea port of Constanta June 5, 2014. Hagel will visit the U.S. cruiser Vella Gulf on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. REUTERS/Bogdan Cristel (ROMANIA - Tags: POLITICS MILITARY TPX IMAGES OF THE DAY) 

Romania's Defence Minister Mircea Dusa (R) welcomes U.S. Defence Secretary Chuck Hagel, in the Black Sea port of Constanta June 5, 2014. Hagel will visit the U.S. cruiser Vella Gulf on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. REUTERS/Bogdan Cristel (ROMANIA - Tags: MILITARY POLITICS) 

Romania's Defence Minister Mircea Dusa (front, L) and U.S. Defence Secretary Chuck Hagel review an honour guard in the Black Sea port of Constanta June 5, 2014. Hagel will visit the U.S. cruiser Vella Gulf on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. REUTERS/Bogdan Cristel (ROMANIA - Tags: MILITARY POLITICS) 

Romania's Defence Minister Mircea Dusa (L) and U.S. Defence Secretary Chuck Hagel review an honour guard in the Black Sea port of Constanta June 5, 2014. Hagel will visit the U.S. cruiser Vella Gulf on rotational duty in the Black Sea, before making his way to Normandy to commemorate the 70th anniversary of the D-Day invasion. REUTERS/Bogdan Cristel (ROMANIA - Tags: MILITARY POLITICS) 

U.S. World War II veteran Jack W. Schlegel, 91 years-old from Mount Tremper, New York, who served with the 508 PIR, 82nd Airborne, attends a ceremony in Houesville June 4, 2014. Schlegel parachuted onto the Normandy coast in the early hours of June 6, 1944. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Pascal Rossignol (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS)

British World War Two Commando Jim Daw (R) of Winster, Derbyshire, speaks with a group of British paratroopers from 16 Air Assault Brigade outside the Pegasus bridge cafe in Benouville, June 4, 2014. Some 3,000 veterans are among those attending ceremonies across the Normandy coastline where Allied forces landed in the largest seaborne invasion in history seventy years ago to help speed up the defeat of Nazi Germany in the Second World War. REUTERS/Chris Helgren (FRANCE - Tags: POLITICS ANNIVERSARY CONFLICT)

British World War Two Commando Jim Daw of Winster, Derbyshire, speaks with Arlette Gondree (L), owner of the Pegasus bridge cafe in Benouville, June 4, 2014. Gondree was four years old when the cafe, owned by her parents, was liberated by British glider-borne troops after midnight on June 6, 1944. Some 3,000 veterans are among those attending ceremonies across the Normandy coastline where Allied forces landed in the largest seaborne invasion in history seventy years ago to help speed up the defeat of Nazi Germany in the Second World War. REUTERS/Chris Helgren (FRANCE - Tags: POLITICS ANNIVERSARY CONFLICT)

U.S. World War II veteran Jack W. Schlegel, 91 years-old from Mount Tremper, New York, who served with the 508 PIR, 82nd Airborne, poses near a "Freedom Road" milepost during a ceremony in Houesville June 4, 2014. Schlegel parachuted onto the Normandy coast in the early hours of June 6, 1944. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Pascal Rossignol (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS)

U.S. World War II veteran Jack W. Schlegel (L), 91 years-old from Mount Tremper, New York, who served with the 508 PIR, 82nd Airborne, waves as he leaves a ceremony aboard a jeep in Houesville June 4, 2014. Schlegel parachuted onto the Normandy coast in the early hours of June 6, 1944. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Pascal Rossignol (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS TPX IMAGES OF THE DAY)

U.S. World War II veteran Jack W. Schlegel, 91 years-old from Mount Tremper, New York, who served with the 508 PIR, 82nd Airborne, wipes away tears during a ceremony in Houesville June 4, 2014. Schlegel parachuted onto the Normandy coast in the early hours of June 6, 1944. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Pascal Rossignol (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS)

U.S. World War II veteran Jack W. Schlegel, 91 years-old from Mount Tremper, New York, who served with the 508 PIR, 82nd Airborne, holds the hand on his heart during the French national anthem during a ceremony in Houesville June 4, 2014. Schlegel parachuted onto the Normandy coast in the early hours of June 6, 1944. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Pascal Rossignol (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS)

U.S. World War II veteran Jack W. Schlegel (L), 91 years-old from Mount Tremper, New York, who served with the 508 PIR, 82nd Airborne, waves as he leaves a ceremony aboard a jeep in Houesville June 4, 2014. Schlegel parachuted onto the Normandy coast in the early hours of June 6, 1944. Some 3,000 veterans are among those attending ceremonies across the northern French coastline where Allied forces landed in the largest seaborne invasion in history June 6, 1944 to help speed up the defeat of Nazi Germany in World War Two. REUTERS/Pascal Rossignol (FRANCE - Tags: CONFLICT ANNIVERSARY POLITICS)