Staff Sgt. Rober Williams and Sgt. Mathew May from

Staff Sgt. Rober Williams and Sgt. Mathew May from 2nd Battalion, 503rd Infantry Regiment, 173rd Airborne Brigade help soldiers from the Afghan national army connect a grenade launcher to his AK-47 before training on how to enter and exit a CH-47 Chinook April 11 in preparation for Operation Rock Tempest that began April 12, at Forward Operating Base Fortress in the Konar province, Afghanistan. (U.S. Army photograph/Sgt. Johnny R. Aragon)