Marines tread water during a reconnaissance screener

Marines tread water during a reconnaissance screener test at the Camp Hansen pool, Okinawa, Japan, June 29, 2018. The screener evaluated the Marines’ performance in preparation for the Basic Reconnaissance Course through a series of physically demanding tests. The screener included a physical fitness test, two obstacle courses, an eight-mile run with a 55-pound pack and multiple swimming exercises. (U.S. Marine Corps photo by Pfc. Kaleb Martin)