Staff Sgt. Jon Porubsky, 707th Intelligence, Surveillance and Reconnaissance Group security specialist, Fort Meade, Md., runs back to the start-finish line located at the Air Mobility Command Museum just over a mile away during the 18th Annual Security Forces Ruck March, Feb. 25, 2017, on Dover Air Force Base, Del. Carrying a 30-pound ruck on his back, Porubsky placed first in the individual category by completing the 6.6-mile course in 54 minutes, 23 seconds. The ruck march is an annual event commemorating the Korean War Battle of the Chosin Reservoir, November-December 1950. (U.S. Air Force photo by Roland Balik)
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