181014-N-AT530-0156 ATLANTIC OCEAN (Oct. 14, 2018) Machinist's Mate Fireman Leslie Hernandez collects a sample of JP-5 jet fuel while underway aboard the amphibious dock landing ship USS Fort McHenry (LSD 43) as part of the Carrier Strike Group (CSG) 4 composite training unit exercise (COMPTUEX). COMPTUEX is the final pre-deployment exercise that certifies the combined Kearsarge Amphibious Ready Group (ARG) and 22nd Marine Expeditionary Unit’s (MEU) abilities to conduct military operations at sea and project power ashore through joint planning and execution of challenging and realistic training scenarios. CSG 4 mentors, trains and asses East Coast units preparing for future deployments. (U.S. Navy photo by Mass Communication Specialist 3rd Class Chris Roys/RELEASED)