Air Force Chief of Staff Gen. Mark A. Welsh III and his wife, Betty, attend a wreath-laying ceremony by President Barack Obama at the Tomb of the Unknowns in Arlington National Cemetery in observance of Veterans Day, Nov. 11, 2012. (U.S. Air Force photo/Scott M. Ash) Secretary of the Air Force Michael Donley attends a wreath laying ceremony in observance of Veterans Day on Nov. 11, 2012, at the Air Force Memorial in Arlington, Va. (U.S. Air Force photo/Andy Morataya) Retired Gen. Richard Shaud, former executive director for the Air Force Association, addresses the audience who attended a wreath laying ceremony in observance of Veterans Day on Nov. 11, 2012, at the Air Force Memorial in Arlington, Va. (U.S. Air Force photo/Andy Morataya) Retired Gen. Richard Shaud, former executive director for the Air Force Association, and retired Chief Master Sgt. David Popp, deputy chief executive officer for the Air Force Sergeants Association, lay a wreath at the Air Force Memorial in observance of Veterans Day on Nov. 11, 2012, in Arlington, Va. (U.S. Air Force photo/Andy Morataya) Airman 1st Brian O'Conner, from the Air Force Honor Guard, creates a shadow on the ground as he stands ready to assist during a wreath laying ceremony at the Air Force Memorial in observance of Veterans Day on Nov. 11, 2012, in Arlington, Va. The ceremony was co-hosted by the Air Force Association and Air Force Sergeants Association; Secretary of the Air Force Michael Donley and Air Force Vice Chief of Staff Larry O. Spencer attended. (U.S. Air Force photo/Andy Morataya) Air Force Vice Chief of Staff Gen. Larry Spencer attends a wreath laying ceremony in observance of Veterans Day on Nov. 11, 2012, at the Air Force Memorial in Arlington, Va. (U.S. Air Force photo/Andy Morataya) Senior leaders attend wreath-laying ceremony at Tomb of Unknowns 11/13/2012 - WASHINGTON (AFNS) -- Air Force Chief of Staff Gen. Mark A. Welsh III and his wife, Betty, attend a wreath-laying ceremony by President Barack Obama at the Tomb of the Unknowns in Arlington National Cemetery in observance of Veterans Day, Nov. 11, 2012. (U.S. Air Force photo/Scott M. Ash)