Gunnery Sgt. Ida Mareno, the S-1 chief for Headquarters Battalion, Marine Corps Base Hawaii (MCBH), walks across a log during a battalion physical training event, MCBH, Dec. 15, 2017. After completing the obstacle course, Marines with HQBN ran in squad size teams across base, stopping to swim 100 meters at the base pool, and continued the run with various other intermittent exercises. ( Marine Corps

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