U.S. Army Sgt. Christopher Calloway adjusts his helmet visor. U.S. Army Sgt. Christopher Calloway adjusts his helmet visor as he mans a weapon in a CH-47 Chinook helicopter during a flight over Salah Ad Din province, Iraq, on Nov. 16, 2006. Calloway is a flight engineer with Bravo Company, 25th Aviation Brigade, 25th Infantry Division. SHARE: Download: Full Size (0.1 MB) Credit: VIRIN: 265712-D-ZIX90-218.jpg Photo Gallery