In this Aug. 26, 2011 photo, U.S. Marines with 3rd Platoon, Kilo Company, 3/4 Marines work out together using ammunition cases as weights in a courtyard at Patrol Base 302, in the Gesresk Valley, Helmand province, southern Afghanistan. The Marines of 3rd Platoon who live inside the mud-walled compound of PB-302 face Taliban militants who regularly attack the base from multiple directions using launched grenades, sniper rifles, and AK-47s. (AP Photo/Brennan Linsley)