180320-N-RI884-0234 PHILIPPINE SEA (March 20, 2018) A MK-38 (Mod 2) 25 mm machine gun system aboard the amphibious assault ship USS Wasp (LHD 1) is fired as part of a gun exercise. Wasp, part of the Wasp Expeditionary Strike Group, with embarked 31st Marine Expeditionary Unit, is operating in the Indo-Pacific region to enhance operability with partners, serve as a ready-response force for any type of contingency and advance the Up-Gunned ESG concept. (U.S. Navy photo by Mass Communication Specialist 1st Class Daniel Barker/Released)