COBRA PREP Marines work on an AH-1 Cobra helicopter on the flight deck of the amphibious transport dock ship USS Anchorage in the Pacific Ocean, June 2, 2015. The Marines are assigned to Marine Medium Tiltrotor Squadron 161. SHARE IMAGE: Download Image: Full Size (0.05 MB) Photo By: VIRIN: 861379-E-SDX50-491.jpg Photo Gallery