MARINE CORPS BASE HAWAII, KANEOHE BAY, HI, UNITED STATES

U.S. Marine Corps Pfc. Michael Garziano, an infantryman with Detachment 4th Force Reconnaissance Company, touches the bottom of the pool as part of a water treading exercise during a training event, Marine Corps Base Hawaii, Jan. 22, 2018. The event consisted of various exercises, including a 25 meter underwater swim, static breath holds, a 1km swim, 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. (U.S. Marine Corps photo by Lance Cpl. Luke Kuennen)

Photo courtesy of DVIDS