Cpl. Robert MacQuarrie, of Framingham, Mass., and Lance Cpl. Brooks Cornell, of Taunton, Mass., both reserve machine gunners with MARFOR Unitas, teach a Peruvian Marine how to fire the Mk-19 40mm automatic grenade launcher, during a bilateral training exercise in Salinas Bay, Peru, Sept. 19. Photo by: Staff Sgt. Sam Kille

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