A sledge hammer leans against a tire at the hammer-swing station of a physical training session at Soto Cano Air Base, Honduras June 03, 2015. This is one of many exercises in the grueling workout know as “Sgt. Maj. PT,” a training session led JTF-B’s Command Sgt. Maj., Nelson Callahan, that encourages members to “lead by example, to break a sweat, to blast [their] core and to build unit cohesion” (U.S. Air Force graphic by Capt. Christopher Love).