Four F-16 Fighting Falcons line up at the end of the runway at Aviano for final checks. Four U.S. Air Force F-16 Fighting Falcons line up at the end of the runway at Aviano Air Base, Italy, for final checks before taking off on NATO Operation Allied Force missions on May 21, 1999. Operation Allied Force is the air operation against targets in the Federal Republic of Yugoslavia. The aircraft are deployed to the 31st Air Expeditionary Wing at Aviano from the 20th Fighter Wing, Shaw Air Force Base, S.C. SHARE: Download: Full Size (0.04 MB) Credit: VIRIN: 081648-I-FZI43-361.jpg Photo Gallery