Members of the Air Force Band's Singing Sergeants perform the National Anthem at the Nationals' "Air Force Salute" at Nationals Park, Washington, D.C., Sept. 25, 2014. The Nationals celebrated the Air Force birthday with Secretary of the Air Force Deborah Lee James throwing the first pitch and Air Force Chief of Staff Gen. Mark A. Welsh III delivering the first ball, and approximately 50 Airmen lined the field to open the game with the New York Mets. (U.S. Air Force photo/Scott M. Ash)

Secretary of the Air Force Deborah Lee James and Air Force Chief of Staff Gen. Mark A. Welsh III (center) wave Nationals' baseball hats during the Nationals' "Air Force Salute" at Nationals Park, Washington, D.C., Sept. 25, 2014. The Nationals celebrated the Air Force birthday with James throwing the first pitch and Welsh delivering the first ball, and approximately 50 Airmen lined the field to open the game with the New York Mets. (U.S. Air Force photo/Scott M. Ash)

Fans of Nationals' baseball applaud Airmen during a game against New York Mets during the Nationals' "Air Force Salute" at Nationals Park, Washington, D.C., Sept. 25, 2014. The Nationals celebrated the Air Force birthday with Secretary of the Air Force Deborah Lee James throwing the first pitch and Air Force Chief of Staff Gen. Mark A. Welsh III delivering the first ball, and approximately 50 Airmen lined the field to open the game with the New York Mets. (U.S. Air Force photo/Scott M. Ash)

Secretary of the Air Force Deborah Lee James throws the first pitch during the Nationals' "Air Force Salute" at Nationals Park, Washington, D.C., Sept. 25, 2014. Inaddition to James' first pitch, the Nationals celebrated the Air Force birthday with Air Force Chief of Staff Gen. Mark A. Welsh III delivering the first ball, and approximately 50 Airmen lined the field to open the game. (U.S. Air Force photo/Scott M. Ash)

Secretary of the Air Force Deborah Lee James throws the first pitch during the Nationals' "Air Force Salute" at Nationals Park, Washington, D.C., Sept. 25, 2014. Inaddition to James' first pitch, the Nationals celebrated the Air Force birthday with Air Force Chief of Staff Gen. Mark A. Welsh III delivering the first ball, and approximately 50 Airmen lined the field to open the game. (U.S. Air Force photo/Scott M. Ash)

Air Force Chief of Staff Gen. Mark A. Welsh III applauds with Airmen during the Nationals' "Air Force Salute" at Nationals Park, Washington, D.C., Sept. 25, 2014. The Nationals celebrated the Air Force birthday with Secretary of the Air Force Deborah Lee James throwing the first pitch, Welsh delivering the first ball, and approximately 50 Airmen lined the field to open the game with the New York Mets. (U.S. Air Force photo/Scott M. Ash)