MARINE CORPS BASE HAWAII (Aug. 14, 2021) Marine Corps Lance Cpl. Joshua Castromayor, a rifleman with Alpha Company, Battalion Landing Team 1/1, the 11th Marine Expeditionary Unit (MEU), fires a M32A1 grenade launcher as part of Hawaii Sustainment Exercise (SUSTEX), Aug. 14. During SUSTEX, Alpha Co. conducted a simulated company reinforcement mission and various live-fire ranges to enhance proficiency in marksmanship and combat effectiveness.


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