U.S. Army soldiers board a CH-47 Chinook helicopter in Khowst province. U.S. Army soldiers with 1st Battalion, 6th Field Artillery Regiment, 3rd Brigade, 1st Infantry Division, Focused Targeting Force, board a CH-47 Chinook helicopter in Khowst province, Afghanistan, on March 29, 2011. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 927260-H-NMP46-445.jpg Photo Gallery