Lt. Col. Mathew Contreras, Joint Task Force-Bravo deputy commanding officer, jumps onto a stack of tires during a specialized physical training session June 03, 2015, at Soto Cano Air Base, Honduras. Known as “Sgt. Maj. PT,” these workouts, led by Command Sgt. Maj. Nelson Callahan, JTF-B Command Sgt. Maj., afford service members the chance to strengthen themselves physically and as a team (U.S. Air Force photo by Capt. Christopher Love).