Chuck “The Iceman” Liddell, a retired American mixed martial artist, tightens a bolt on a guided bomb unit-31 on Osan Air Base, South Korea, Aug. 5, 2015. Liddell visited various units across the base during a morale trip. Liddell is a former Ultimate Fighting Championship light heavyweight champion. He has an extensive striking background in Kempo, Koei-Kan karate, and kickboxing, as well as a grappling background in collegiate wrestling and Brazilian Jiu-Jitsu. (U.S. Air Force photo/Senior Airman Kristin High)