Cycling - UCI Road Cycling World Championships - Innsbruck-Tirol, Austria - September 30, 2018 Denmark's Kasper Asgreen and Ireland's Conor Dunne and Ryan Mullen in action during the Men's Elite Road Race REUTERS/Heinz-Peter Bader

Cycling - UCI Road Cycling World Championships - Innsbruck-Tirol, Austria - September 26, 2018 Ireland's Ryan Mullen during the Men's Elite Individual Time Trial REUTERS/Heinz-Peter Bader

Cycling - UCI Road Cycling World Championships - Innsbruck-Tirol, Austria - September 26, 2018 Ireland's Ryan Mullen during the Men's Elite Individual Time Trial REUTERS/Heinz-Peter Bader

Actor Peter Mullen attends the UK premiere of the film 'War Horse' in London January 8, 2012. REUTERS/Paul Hackett (BRITAIN - Tags: ENTERTAINMENT SOCIETY PROFILE)

Singer Bono (R) and Larry Mullen of U2 perform during the "360 Degrees" Tour at Slaski Stadium in Chorzow August 6, 2009. REUTERS/Peter Andrews (POLAND ENTERTAINMENT)

Larry Mullen of U2 walks on stage for the "360 Degrees" Tour at Slaski Stadium in Chorzow August 6, 2009. REUTERS/Peter Andrews (POLAND ENTERTAINMENT IMAGES OF THE DAY)

Chairman of the U.S. Joint Chiefs of Staff Admiral Mike Mullen (L) speaks as Richard Holbrooke (C), special U.S. envoy to Afghanistan and Pakistan and U.S. Charge d'Affaires in India, Peter Burleigh watch during a news conference in New Delhi April 8, 2009. Holbrooke will meet Indian officials on Wednesday amid concern in New Delhi that Washington's new regional strategy for Afghanistan is pandering to its old foe Pakistan. REUTERS/B Mathur (INDIA MILITARY POLITICS)

U.S. President George W. Bush (2nd L) shakes hands with incoming Chairman of the Joint Chiefs of Staff, Admiral Mike Mullen during a farewell tribute for outgoing Chairman General Peter Pace (L) at Fort Myer in Arlington, Virginia October 1, 2007. Watching on in U.S. Secretary of Defense Robert Gates (2nd R). REUTERS/Jason Reed (UNITED STATES)

Outgoing Chairmen of the Joint Chiefs of Staff Gen. Peter Pace walks away after speaking at his farewell tribute at Fort Myer in Arlington, Virginia October 1, 2007. Pace will be replaced by Admiral Michael Mullen (2nd R). Taking the rostrum is U.S. Secretary of Defense Robert Gates. REUTERS/Kevin Lamarque (UNITED STATES)

U.S. President George W. Bush (R) watches on as outgoing Chairman of the Joint Chiefs of Staff Gen. Peter Pace laughs during his farewell tribute at Fort Myer in Arlington, Virginia October 1, 2007. Pace will be replaced by Admiral Michael Mullen (R). Standing beside Bush is U.S. Secretary of Defense Robert Gates. REUTERS/Jason Reed (UNITED STATES)

Outgoing U.S. Chairman of the Joint Chiefs of Staff, General Peter Pace speaks during an armed services farewell tribute in his honour at Fort Myer in Arlington, Virginia October 1, 2007. Pace will be replaced by Admiral Mike Mullen. REUTERS/Jason Reed (UNITED STATES)

Former U.S. Defense Secretary Donald Rumsfeld (C) sits with other invited guests in the audience during an armed forces farewell tribute to outgoing U.S. Chairman of the Joint Chiefs of Staff, General Peter Pace at Fort Myer in Arlington, Virginia October 1, 2007. Pace is being replaced by Admiral Mike Mullen. REUTERS/Jason Reed (UNITED STATES)

U.S. Defense Secretary Robert Gates (L) kisses Lynne Pace (C), the wife of outgoing U.S. Chairman of the Joint Chiefs of Staff, General Peter Pace (R), after Gates presented her with an honourary medal during Pace's armed forces farewell tribute in Arlington, Virginia October 1, 2007. Pace will be replaced by Admiral Mike Mullen. REUTERS/Jason Reed (UNITED STATES)

Outgoing U.S. Chairman of the Joint Chiefs of Staff, General Peter Pace, salutes fellow marines as he inspects an honour guard during his armed forces farewell tribute at Fort Myer in Arlington, Virginia October 1, 2007. Pace will be replaced by Admiral Mike Mullen. REUTERS/Jason Reed (UNITED STATES)

Members of the official party taking part in an armed services farewell tribute for outgoing U.S. Chairman of the Joint Chiefs of Staff, General Peter Pace (L), watch a military band march past at Fort Myer in Arlington, Virginia October 1, 2007. With Pace are (2nd L-R) U.S. President George W. Bush, U.S. Secretary of Defense Robert Gates and incoming Chairman of the Joint Chiefs of Staff Admiral Mike Mullen. REUTERS/Jason Reed (UNITED STATES)

A gun salute is fired during an armed services farewell tribute for outgoing U.S. Chairman of the Joint Chiefs of Staff, General Peter Pace at Fort Myer in Arlington, Virginia October 1, 2007. Pace will be replaced by Admiral Mike Mullen. REUTERS/Jason Reed (UNITED STATES)

Members of the official party taking part in a farewell tribute for outgoing U.S. Chairman of the Joint Chiefs of Staff, General Peter Pace (Saluting, Top L), honour a passing parade of U.S. Marines at Fort Myer in Arlington, Virginia October 1, 2007. With Pace are (2nd L-R) his wife Lynne, U.S. President George W. Bush, U.S. Secretary of Defense Robert Gates, Deborah Mullen and incoming Chairman of the Joint Chiefs of Staff Admiral Mike Mullen. REUTERS/Jason Reed (UNITED STATES)

Members of the official party taking part in a farewell tribute for outgoing U.S. Chairman of the Joint Chiefs of Staff, General Peter Pace (L), watch a military flyover in his honour at Fort Myer in Arlington, Virginia October 1, 2007. With Pace are (Front row, 2nd L-R) his wife Lynne, U.S. President George W. Bush, U.S. Secretary of Defense Robert Gates, Deborah Mullen and incoming Chairman of the Joint Chiefs of Staff Admiral Mike Mullen. REUTERS/Jason Reed (UNITED STATES)

Outgoing Chairman of the Joint Chiefs of Staff Gen. Peter Pace kisses his wife Lynne after presenting her with a bouquet during his farewell tribute at Fort Myer in Arlington, Virginia October 1, 2007. Pace will be replaced by Admiral Michael Mullen. REUTERS/Jason Reed (UNITED STATES)

U.S. President George W. Bush shakes hands with outgoing Chairman of the Joint Chiefs of Staff Gen. Peter Pace during his farewell tribute at Fort Myer in Arlington, Virginia October 1, 2007. Pace will be replaced by Admiral Michael Mullen (R). Standing beside Bush is U.S. Secretary of Defense Robert Gates. REUTERS/Jason Reed (UNITED STATES)

Outgoing Chairmen of the Joint Chiefs of Staff Gen. Peter Pace (L), U.S. Secretary of Defense Robert Gates (C), and incoming Chairman of the Joint Chiefs of Staff Admiral Michael Mullen, applaud as U.S. President George W. Bush speaks during a farewell tribute to Pace at Fort Myer in Arlington, Virginia October 1, 2007. REUTERS/Kevin Lamarque (UNITED STATES)

Outgoing Chairmen of the Joint Chiefs of Staff Gen. Peter Pace (L), U.S. President George W. Bush, U.S. Secretary of Defense Robert Gates (2nd R), and incoming Chairman of the Joint Chiefs of Staff Admiral Michael Mullen, stand together during a farewell tribute to Pace at Fort Myer in Arlington, Virginia October 1, 2007. REUTERS/Kevin Lamarque (UNITED STATES)

Outgoing Chairmen of the Joint Chiefs of Staff Gen. Peter Pace (L), U.S. President George W. Bush, U.S. Secretary of Defense Robert Gates (2nd R), and incoming Chairman of the Joint Chiefs of Staff Admiral Michael Mullen, sit together during a farewell tribute to Pace at Fort Myer in Arlington, Virginia October 1, 2007. REUTERS/Kevin Lamarque (UNITED STATES)

Outgoing Chairmen of the Joint Chiefs of Staff Gen. Peter Pace (L), U.S. President George W. Bush, U.S. Secretary of Defense Robert Gates (R), and incoming Chairman of the Joint Chiefs of Staff Admiral Michael Mullen, sit together during a farewell tribute to Pace at Fort Myer in Arlington, Virginia October 1, 2007. REUTERS/Kevin Lamarque (UNITED STATES)

Outgoing Chairmen of the Joint Chiefs of Staff Gen. Peter Pace (L), U.S. President George W. Bush, U.S. Secretary of Defense Robert Gates, and incoming Chairman of the Joint Chiefs of Staff Admiral Michael Mullen (R), bow their heads during a farewell tribute to Pace at Fort Myer in Arlington, Virginia October 1, 2007. REUTERS/Kevin Lamarque (UNITED STATES)

U.S. President George W. Bush shakes hands with outgoing Chairmen of the Joint Chiefs of Staff Gen. Peter Pace during his farewell tribute at Fort Myer in Arlington, Virginia October 1, 2007. Pace will be replaced by Admiral Michael Mullen (2nd R). Standing beside Bush is U.S. Secretary of Defense Robert Gates. REUTERS/Kevin Lamarque (UNITED STATES)

Outgoing Secretary of Defense Donald Rumsfeld (2nd L) leaves a press availability on Iraq at the Pentagon in Washington, December 13, 2006. Rumsfeld is joined by (rear (L-R) Chief of Staff of the Army General Peter Schoomaker, Chief of Naval Operations Admiral Mike Mullen, Chief of Staff of the Air Force General Michael Moseley and Commandant of the Marine Corps General Jim Conway. REUTERS/Jim Young (UNITED STATES)

U.S. President George W. Bush (3rd R) delivers remarks on Iraq at the Pentagon in Washington December 13, 2006. Bush is joined by (L-R) Vice President Dick Cheney, Chief of Naval Operations Admiral Mike Mullen, Chairman of the Joint Chiefs of Staff General Peter Pace, Chief of Staff of the Air Force General Michael Moseley, Vice Chairman of the Joint Chiefs of Staff Admiral Ed Giambastiani and outgoing Secretary of Defense Donald Rumsfeld. REUTERS/Jim Young (UNITED STATES)

Rock band "U2" arrives at the MTV Video Music Awards in New York, September 6, 2001. Pictured (L-R) are Bono, Adam Clayton, Larry Mullen Jr. and The Edge. The group is nominated for the Best Video of the Year for their song "Beautiful Day." REUTERS/Peter Morgan

JC