PUSH-UP POWER U.S. Marines execute squad push-ups as body-hardening training while aboard the dock landing ship USS Gunston Hall in the Southern Command area of responsibility, Jan. 17, 2011. The Marines, assigned to Marine Wing Support Squadron 271, Logistics Command Element, Headquarters Command Element, will head to Central and South America to participate in Southern Partnership exercises. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 230677-P-YZP38-320.jpg Photo Gallery