160616-N-YL257-005 PORTSMOUTH, Va. (June 16, 2016) Machinery Repairman 1st Class Gary Spence, Lt. Brian Shea and Hull Maintenance Technician Fireman Belen Mendoza participate in a gas mask leak test aboard the aircraft carrier USS George H.W. Bush (CVN 77). GHWB is undergoing a planned incremental availability period at Norfolk Naval Shipyard.  (U.S. Navy photo by Mass Communication Specialist 3rd Class Christopher D. Gaines/Released)
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