150408-N-FV739-001 PACIFIC OCEAN (April 8, 2015) Marines conduct electrical maintenance on an MV-22 Osprey from the Greyhawks of Marine Medium Tilitrotor Squadron (VMM) 161 (Reinforced) on the flight deck of Wasp-class amphibious assault ship USS Essex (LHD 2). Essex is underway participating in a certification exercise (CERTEX) with the Essex Amphibious Ready Group (ARG). (U.S. Navy photo by Mass Communication Specialist Seaman Christopher A. Veloicaza/Released)