Juan Rivera, S-6 director, instructs Lance Cpl. Hector Arenas, S-1 clerk, who's honing his grappling technique on Petty Officer 3rd Class Nicholas Vath, corpsman, while attending a session for the grappling club at Semper Fit Gym aboard Marine Corps Logistics Base Barstow, Calif., Feb. 15.

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Keywords: #grappling, #juanrivera, #mclbbarstow, #selfdefense, air, america, armed, army, defence, employee, federal, force, forces, government, military, navy, service, serviceman, servicemen, states, united, usa