A Marine Corps infantryman with Detachment 4th Force Reconnaissance Company conducts a 1km swim during a pool training event, Marine Corps Base Hawaii, Jan. 22, 2018. The event consisted of various exercises, including a 25 meter underwater swim, static breath holds, treading exercises, and gear retrievals. The unit’s training program aims to prepare students for the stresses of the BRC by offering a broad, realistic curriculum, challenging them both mentally and physically. ( Marine Corps photo by Lance Cpl. Luke Kuennen)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: 4th, force, mcbh, mokapu, peninsula, recon, training, usmc