Lowering Canopy Air Force Lt. Col. Mark Sletten lowers the canopy on an F-16 Fighting Falcon before taxiing to take off at Eielson Air Force Base, Alaska, Dec. 7, 2015. Sletten is an F-35 Lightning II program integration officer. U.S. Air Force photo by Master Sgt. Joseph Swafford SHARE: Download: Full Size (1 MB) Credit: Master Sgt. Joseph Swafford VIRIN: 151214-D-HV319-001.JPG Photo Gallery