A fallen pink dogwood flower petal lies in the pine straw near the 8th hole during the 2017 Masters at Augusta National Golf Club in Augusta, Georgia, U.S. April 4, 2017. REUTERS/Jonathan Ernst SEARCH "AUGUSTA CLOSE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Artist Janet Frankovic paints a blooming dogwood tree in Sligo Creek Park in Silver Spring, Maryland March 15, 2012. Extremely warm spring weather, with temperatures reaching 82 degrees Fahrenheit, has arrived in the nation's capital region. REUTERS/Gary Cameron (UNITED STATES - Tags: ENVIRONMENT)

Artist Janet Frankovic paints a blooming dogwood tree in Sligo Creek Park in Silver Spring, Maryland March 15, 2012. Extremely warm spring weather, with temperatures reaching 82 degrees Fahrenheit, has arrived in the nation's capital region. REUTERS/Gary Cameron (UNITED STATES - Tags: ENVIRONMENT)

Artist Janet Frankovic paints a blooming dogwood tree in Sligo Creek Park in Silver Spring, Maryland March 15, 2012. Extremely warm spring weather, with temperatures reaching 82 degrees Fahrenheit, has arrived in the nation's capital region. REUTERS/Gary Cameron (UNITED STATES - Tags: ENVIRONMENT)

Some buds on a dogwood tree are coated with ice from a winter storm in Wilmington, Delaware, January 28, 2009. REUTERS/Tim Shaffer (UNITED STATES)

Victoria Baker (R) wraps up in a blanket as she waits in line to cast her ballot at Dogwood Neighborhood Senior Center for the U.S. presidential election in Atlanta, Georgia, November 4, 2008. REUTERS/Tami Chappell (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA)

Olivia Robinson signs the side of a bus, with pictures and words of encouragement for U.S. Democratic presidential nominee Senator Barack Obama (D-IL), that had brought voters to the polls at Dogwood Neighborhood Senior Center for the U.S. Presidential election in Atlanta,Georgia, November 4, 2008. REUTERS/Tami Chappell (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA)

Artist Yoko Ono smiles during the "Wish Tree for Washington D.C." ceremony in the Hirshhorn Museum's sculpture garden in Washington, April 2, 2007. As part of a wider art project where members of the public are invitied to place their own wishes on the tree, Ono dedicated the tree in the spirit and goodwill of the initial 1912 gift of cherry blossom trees to the U.S. from Japan. REUTERS/Jason Reed (UNITED STATES)

Artist Yoko Ono writes a wish for peace onto a piece of paper before tying it to a branch of a Japanese-flowering Dogwood tree at a "Wish Tree for Washington D.C." ceremony in the Hirshhorn Museum's sculpture garden in Washington April 2, 2007. As part of a wider art project where members of the public are invitied to place their own wishes on the tree, Ono dedicated the tree in the spirit and goodwill of the initial 1912 gift of cherry blossom trees to the U.S. from Japan. REUTERS/Jason Reed (UNITED STATES)

A handwritten wish for peace by artist Yoko Ono is displayed after being tied to a branch of a Japanese-flowering Dogwood tree at a "Wish Tree for Washington D.C." ceremony in the Hirshhorn Museum's sculpture garden in Washington April 2, 2007. As part of a wider art project where members of the public are invitied to place their own wishes on the tree, Ono dedicated the tree in the spirit and goodwill of the initial 1912 gift of cherry blossom trees to the U.S. from Japan. REUTERS/Jason Reed (UNITED STATES)

Artist Yoko Ono ties her handwritten wish for peace onto the branch of a Japanese-flowering Dogwood tree at the "Wish Tree for Washington D.C." ceremony in the Hirshhorn Museum's sculpture garden in Washington April 2, 2007. As part of a wider art project where members of the public are invited to place their own wishes on the tree, Ono dedicated the tree to the spirit and goodwill of the initial 1912 gift of cherry blossom trees to the U.S. from Japan. REUTERS/Jason Reed (UNITED STATES)

Britain's Prince Charles (L) and Camilla, Duchess of Cornwall (2L) meet Sergeant Mick Brennan at the Defence Medical Rehabilitation Centre, southern England, November 24, 2005. Brennan, lost both legs in a suicide car bomb attack at Camp Dogwood in Iraq in November 2004. REUTERS/Paul Hackett

U.S. explosive ordnance disposal team members, along with soldiers of the 150th Engineer Battalion, 155th Brigade Combat Team are seen in this handout picture, preparing for the destruction of a portion of the large cache found recently near U.S. Forward Operating Base Dogwood south of the Iraqi capital Baghdad, in this handout photograph released on March 28, 2005. REUTERS/US Army/Handout HH/KS

Sergeant Barry Robertson of the Black Watch Battle Group burns remnants of Camp Dogwood as the Black Watch move back to southern Iraq at the end of their deployment to Camp Dogwood, December 4, 2004. The Black Watch have had 850 soldiers operating for 30 days at Camp Dogwood and have had five soldiers killed. Picture taken December 2, 2004. REUTERS/Nick Allen/Pool DBP/THI

Tanks of the Queens Dragoon Guards near Najaf as the Black Watch Battle Group move back to southern Iraq at the end of their deployment to Camp Dogwood, December 4, 2004. The Black Watch have had 850 soldiers operating for 30 days at Camp Dogwood and have had five soldiers killed. Picture taken December 2, 2004. REUTERS/Nick Allen/Pool DBP/THI

U.S. soldiers escorting the convoy prepare to move out as the Black Watch Battle Group move back to southern Iraq at the end of their deployment to Camp Dogwood, December 3, 2004. The Black Watch have had 850 soldiers operating for 30 days at Camp Dogwood and have had five soldiers killed. Picture taken December 3, 2004. REUTERS/HO DBP/THI

Colonel Ron Johnson (L) eats some traditional Scottish fudge offered to him by the Commanding Officer of A Company as the Black Watch Battle Group move back to southern Iraq at the end of their deployment to Camp Dogwood, December 3, 2004. The Black Watch have had 850 soldiers operating for 30 days at Camp Dogwood and have had five soldiers killed. Picture taken December 3, 2004. REUTERS/HO DBP/THI

Colonel Ron Johnson (R) talks with Lieutenant Colonel James Cowan as the Black Watch Battle Group move back to southern Iraq at the end of their deployment to Camp Dogwood, December 3, 2004. The Black Watch have had 850 soldiers operating for 30 days at Camp Dogwood and have had five soldiers killed. Picture taken December 3, 2004. REUTERS/HO DBP/THI

The Black Watch Battle Group move back to southern Iraq at the end of their deployment to Camp Dogwood, December 3, 2004. The Black Watch have had 850 soldiers operating for 30 days at Camp Dogwood and have had five soldiers killed. Picture taken December 3, 2004. REUTERS/HO DBP/THI

Colonel Ron Johnson (C) carries out his final visit to Camp Dogwood as the Black Watch Battle Group move back to southern Iraq at the end of their deployment to Camp Dogwood, December 3, 2004. The Black Watch have had 850 soldiers operating for 30 days at Camp Dogwood and have had five soldiers killed. Picture taken December 3, 2004. REUTERS/HO DBP/THI

The Black Watch Battle Group move back to southern Iraq at the end of their deployment to Camp Dogwood, December 3, 2004. The Black Watch have had 850 soldiers operating for 30 days at Camp Dogwood and have had five soldiers killed. Picture taken December 3, 2004. REUTERS/HO DBP

The Black Watch Battle Group move back to southern Iraq at the end of their deployment to Camp Dogwood, December 3, 2004. The Black Watch have had 850 soldiers operating for 30 days at Camp Dogwood and have had five soldiers killed. REUTERS/HO DBP/THI

Privates Robert Roberson (L), Ian Porteus (2nd L), Wayne Macky (2nd R) and Lee Beaton (R) of 'A' Company the Black Watch open mail parcels near Camp Dogwood, Iraq on November 26, 2004. Editorial Use Only REUTERS/Michael Dunlea/Pool JD/WS

Privates Robert Roberson (L), Ian Porteus (2nd L), Wayne Macky (2nd R) and Lee Beaton (R) of 'A' Company the Black Watch open mail parcels near Camp Dogwood, Iraq on November 26, 2004. Editorial Use Only REUTERS/Michael Dunlea/Pool JD/WS

Members of Britain's Black Watch sleep after carrying out an operation in a village on the east bank of the Euphrates. Exhausted members of Britain's Black Watch sleep in their Warrior armoured vehicle as they travel back to their base Camp Dogwood, some 25 miles south west of Baghdad, after carrying out an operation in a village on the east bank of the Euphrates November 25, 2004. British troops raided the country villas of some of Saddam Hussein's old guard, rounding up guerrilla suspects, as they joined a U.S.-led offensive against Sunni Muslim insurgents south of Baghdad on Thursday. REUTERS/Michael Dunlea/The Daily Mail/Pool

A British Soldier from the Black Watch cleans the 30mm RARDEN cannon of his Warrior Armoured fighting vehicle during a lull in operations at Camp Dogwood near Baghdad, Iraq, November 20, 2004. The soldiers of the Black Watch are involved in Operation Bracken in support of allied operations to deny freedom of movement to insurgents in the area.
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British soldiers attached to the Black Watch fly in a helicopter on their way to set up a checkpoint in the desert near camp Dogwood 25 miles south of Baghdad, Iraq November 21, 2004. [The British forces stepped up security and changed their check-point procedures after incidents involving suicide bombers.]

British soldiers attached to the Black Watch fly in a helicopter on their way to set up a checkpoint in the desert near camp Dogwood 25 miles south of Baghdad, Iraq November 21, 2004. [The British forces stepped up security and changed their check-point procedures after incidents involving suicide bombers.]

British soldiers from Black Watch find shelter behind their armour vehicles from possible ammunition explosion at Camp Dogwood. British soldiers from Black Watch find shelter behind their armour vehicles from possible ammunition explosion at Camp Dogwood 25 miles south of Baghdad November 21, 2004. The fire started in a tent at Camp Dogwood and sent flames soaring 40ft into the air. REUTERS/Damir Sagolj

British Trooper James Belton of the Queen's Dragoon Guards walks after hearing he became father for the first time, while on duty at camp Dogwood. British Trooper James Belton of the Queen's Dragoon Guards walks inside camp Dogwood 40.2 kilometres (25 miles) south of Baghdad, Iraq November 21, 2004 after hearing he became father for the first time. REUTERS/Damir Sagolj

British Trooper James Belton of the Queen's Dragoon Guards smiles after hearing he became father for the first time, while on duty at Camp Dogwood. British Trooper James Belton of the Queen's Dragoon Guards smiles after hearing he became father for the first time, while on duty at camp Dogwood 40.2 kilometres (25 miles) south of Baghdad, Iraq November 21, 2004. REUTERS/Damir Sagolj

British soldier attached to the Black Watch fly in a helicopter to set up a check-point in the desert near camp Dogwood. British soldiers attached to the Black Watch fly in a helicopter on their way to set up a check-point in the desert near camp Dogwood 40.2 kilometres (25 miles) south of Baghdad, Iraq November 21, 2004. The British forces stepped up security and changed their check-point procedures after incidents involving suicide bombers. REUTERS/Damir Sagolj

British soldiers attached to the Black Watch fly in a helicopter to set up a check-point in the desert near camp Dogwood. British soldiers attached to the Black Watch fly in a helicopter on their way to set up a check-point in the desert near camp Dogwood 40.2 kilometres (25 miles) south of Baghdad, Iraq November 21, 2004. The British forces stepped up security and changed their check-point procedures after incidents involving suicide bombers. REUTERS/Damir Sagolj

A British army helicopter flies behind a British soldier attached to the Black Watch at a check-point in the desert near camp Dogwood. A British army's helicopter flies behind a British soldier attached to the Black Watch at a check-point in the desert near camp Dogwood 40.2 kilometres (25 miles) south of Baghdad, Iraq November 21, 2004. The British forces stepped up security and changed their check-point procedures after incidents involving suicide bombers. REUTERS/Damir Sagoljlj

A British army helicopter flies behind Iraqis approaching check-point set up by British soldiers attached to the Black Watch in the desert near the camp Dogwood. A British helicopter flies behind Iraqis approaching a check point set up by British soldiers attached to the Black Watch in the desert near camp Dogwood 40.2 kilometres (25 miles) south of Baghdad, Iraq November 21, 2004. The British forces stepped up security and changed their check-point procedures after incidents involving suicide bombers. REUTERS/Damir Sagolj Pictures of the Month November 2004

British soldiers attached to the Black Watch fly on helicopter on their way to set up a check-point in the desert near camp Dogwood. British soldiers attached to the Black Watch fly in a helicopter on their way to set up a check-point in the desert near camp Dogwood 40.2 kilometres (25 miles) south of Baghdad, Iraq November 21, 2004. The British forces stepped up security and changed their check-point procedures after incidents involving suicide bombers. REUTERS/Damir Sagolj

British soldier attached to the Black Watch stops Iraqi civilian at a check-point in the desert near Camp Dogwood. A British soldier attached to the Black Watch stops an Iraqi civilian at a check-point in the desert near camp Dogwood, 40.2 kilometres (25 miles) south of Baghdad, Iraq November 21, 2004.The British forces stepped up security and changed their check-point procedures after incidents involving suicide bombers. REUTERS/Damir Sagolj

British soldiers attached to the Black Watch jump out of a helicopter to set up a check-point in the desert near camp Dogwood. British soldiers attached to the Black Watch jump out of a helicopter to set up a check-point in the desert near camp Dogwood, 40.2 kilometres (25 miles) south of Baghdad, Iraq November 21, 2004. The British forces stepped up security and changed their check-point procedures after incidents involving suicide bombers. REUTERS/Damir Sagolj

A British soldier attached to the Black Watch searches an Iraqi man at a check point in the desert near camp Dogwood. A British soldier attached to the Black Watch searches an Iraqi man at a check-point in the desert near camp Dogwood, 40.2 kilometres (25 miles) south of Baghdad, Iraq November 21, 2004. The British forces stepped up security and changed their check-point procedures after incidents involving suicide bombers. REUTERS/Damir Sagolj

A British soldier attached to the Black Watch searches Iraqis at a check-point in the desert near the camp Dogwood. A British soldier attached to the Black Watch searches Iraqis at a check-point in the desert near camp Dogwood, 40.2 kilometers (25 miles) south of Baghdad, Iraq November 21, 2004. The British forces stepped up security and changed their check-point procedures after incidents involving suicide bombers. REUTERS/Damir Sagolj

A British Royal Marine Commando attached to the Black Watch stops Iraqi civilians at a check-point in the desert near camp Dogwood, 40.2 kilometers (25 miles) south of Baghdad, Iraq November 21, 2004. The British forces stepped up security and changed their check-point procedures after incidents involving suicide bombers. REUTERS/Damir Sagolj Pictures of the Month November 2004 DS/JV

British Royal Marine Commandos attached to the Black Watch run to their positions around a check-point in the desert near camp Dogwood, 40.2 kilometers (25 miles) south of Baghdad, Iraq November 21, 2004. The British forces stepped up security and changed their check-point procedures after incidents involving suicide bombers. REUTERS/Damir Sagolj DS/JV

British helicopter gunner surveys the area en-route to set up a check point in the desert near camp Dogwood south of Baghdad. A gunner surveys the area from a Puma helicopter carrying British Royal Marine Commandos attached to the Black Watch, on their way to set up a check-point in the desert near camp Dogwood 40.2 kilometers (25 miles) south of Baghdad, Iraq November 21, 2004. The British forces stepped up security and changed their check-point procedures after incidents involving suicide bombers. REUTERS/Damir Sagolj

British army helicopter flies behind Iraqi man approaching British Royal Marine check-point near camp Dogwood. A British army Puma helicopter flies behind an Iraqi man approaching a check-point set up by British Royal Marine Commandos attached to the Black Watch in the desert near camp Dogwood 40.2 kilometers (25 miles) south of Baghdad, Iraq November 21, 2004. The British forces stepped up security and changed their check-point procedures after incidents involving suicide bombers. REUTERS/Damir Sagolj

A British armoured personnel carrier from the Black Watch battle group drives back to Camp Dogwood 25 miles south of Baghdad. A British armoured personnel carrier from the Black Watch battle group drives back to Camp Dogwood 25 miles south of Baghdad, Iraq November 20, 2004. REUTERS/Damir Sagolj (IRAQ) BEST QUALITY AVAILABLE

British soldiers from the Black Watch relax during a lull in operations at Camp Dogwood near Baghdad November 20, 2004. The sign in Arabic on the WARRIOR Armoured vehicle reads: "Do Not Overtake or We May Open Fire!" The soldiers of the Black Watch are involved in Operation Bracken in support of allied operations to deny freedom of movement to insurgents in the area. REUTERS/Cpl Rob Knight/HO Picture taken November 20, 2004. rk/dbp/acm

A British soldier from the Black Watch cleans weapons and equipment during a lull in operations at Camp Dogwood near Baghdad November 20, 2004. The soldiers of the Black Watch are involved in Operation Bracken in support of allied operations to deny freedom of movement to insurgents in the area. REUTERS/Cpl Rob Knight/HO Picture taken November 20, 2004. rk/dbp/acm

A Fijian soldier from The Black Watch relaxes during a lull in operations at Camp Dogwood near Baghdad, Iraq, November 20, 2004. The soldiers of the Black Watch are involved in Operation Bracken in support of allied operations to deny freedom of movement to insurgents in the area. REUTERS/Cpl Rob Knight/HO rk/dbp/acm

British soldiers from the Black Watch relax during a lull in operations at Camp Dogwood near Baghdad November 20, 2004. The soldiers of the Black Watch are involved in Operation Bracken in support of allied operations to deny freedom of movement to insurgents in the area. REUTERS/Cpl Rob Knight/HO rk/dbp/ACM

A British Soldier from the Black Watch cleans the 30mm RARDEN cannon of his WARRIOR Armoured fighting vehicle during a lull in operations at Camp Dogwood near Baghdad, Iraq, November 20, 2004. The soldiers of the Black Watch are involved in Operation Bracken in support of allied operations to deny freedom of movement to insurgents in the area. REUTERS/Cpl Rob Knight/HO rk/dbp/ACM

British soldiers from the Black Watch reads newspapers during a lull in operations at Camp Dogwood near Baghdad, Iraq, November 20, 2004. The soldiers of the Black Watch are involved in Operation Bracken in support of allied operations to deny freedom of movement to insurgents in the area. REUTERS/Cpl Rob Knight/HO Picture taken November 20, 2004. rk/dbp/ACM

(L-R) Lance Corporal Mike Woodman, Trooper James Belton, Lance Corporal John Wilkinson, Trooper Gavin Griffiths and Trooper Jamie Pickering stand by their Scimitar tank in Camp Dogwood, Iraq November 20, 2004. Soldier James Belton, 21, (2L) who has been at the under fire camp for three weeks, phoned home to speak to his wife Sam and she told him that she was in labour and he was about to be a father for the first time. Named after his Dad, James Joshua weighed 7lb 3oz (3.3 kgs) on November 15. REUTERS/Nick Allen/Pool GB/dbp/THI

A British armoured personnel carrier from the Black Watch battle group drives back to Camp Dogwood 25 miles south of Baghdad. A British armoured personnel carrier from the Black Watch battle group drives back to Camp Dogwood 25 miles south of Baghdad, Iraq November 20, 2004. REUTERS/Damir Sagolj also see GF1DTZVVHWAA

Colour Sgt Kev Wann from Perth, Scotland, a soldier from Delta company of the Black Watch battle group, shaves in front of the Union flag decorating his vehicle at the Camp Dogwood. Colour Sgt Kev Wann from Perth, Scotland, a soldier from Delta company of the Black Watch battle group, shaves in front of the Union flag decorating his vehicle at the Camp Dogwood, 25 miles south of Baghdad, Iraq November 20, 2004. REUTERS/Damir Sagolj

Oliver McDonald from Carmarthen, Wales, a soldier from Delta company of the Black Watch battle group, lifts weight in the shelter of his "Warrior" vehicle after a rocket landed inside the Camp Dogwood. Oliver McDonald from Carmarthen, Wales, a soldier from Delta company of the Black Watch battle group, lifts weight in the shelter of his "Warrior" vehicle inside the Camp Dogwood, 25 miles south of Baghdad, Iraq November 20, 2004. REUTERS/Damir Sagolj

British Royal Marines Commandos attached to the Black Watch regiment prepare for a mission inside Camp Dogwood. A British Royal Marines Commando attached to the Black Watch regiment sits behind his machine gun before a mission at Camp Dogwood 25 miles south of Baghdad, Iraq November 19, 2004. Some 850 British troops are stationed at Camp Dogwood, relocated from the British controlled sector in southern Iraq, to relieve U.S. troops for an assault on the city of Falluja. REUTERS/Damir Sagolj

A British Sergeant from the Royal Engineers prepares an unexploded 107mm rocket for demolition in Camp Dogwood, Iraq. A British Sergeant from the Royal Engineers prepares an unexploded 107mm rocket for demolition in Camp Dogwood, south of Baghdad, Iraq on November 19, 2004. The path of the missile is seen in front of the excavated trench. The rocket was one of those fired at the camp earlier today that failed to explode. A total of seven rockets were fired into the camp on Friday. Editorial Use Only/ ROWN COPYRIGHT RESERVED/ or More Information Contact: irector of Defence Publicity REUTERS/HO/Cpl Rob Knight, RLC Unit: Royal Engineers

British Royal Marines Commandos attached to the Black Watch regiment prepare for a mission inside camp Dogwood. British Royal Marines Commandos attached to the Black Watch regiment walk with their combat gear before a mission at camp Dogwood, 25 miles south of Baghdad, Iraq November 19, 2004. Some 850 British troops are stationed at Camp Dogwood, relocated from the British controlled sector in southern Iraq, to relieve U.S. troops for an assault on the city of Falluja. REUTERS/Damir Sagolj

British soldier from the Black Watch regiment prepares to destroy an unexploded rocket that landed inside Camp Dogwood 25 miles south of Baghdad. A British soldier from the Black Watch regiment prepares to destroy an unexploded rocket that landed inside Camp Dogwood 25 miles south of Baghdad, Iraq, November 19, 2004. REUTERS/Damir Sagolj

British Royal Marines Commandos attached to the Black Watch regiment prepare for a mission inside camp Dogwood. British Royal Marines Commandos attached to the Black Watch regiment joke before a mission at camp Dogwood 25 miles south of Baghdad, Iraq November 19, 2004. REUTERS/Damir Sagolj