Master Sgt. Kay Williams, 919th Special Operations Security Forces Squadron, laces her boots after she and her team paused to care for their feet following a seven-mile ruck march May 5, 2018 near Duke Field, Fla. The event was part of overall Critical Individual Task training for the SOSFS Airmen, a program that precedes more advanced special operations forces training. (U.S. Air Force photo/Master Sgt. Jasmin Taylor)