Keep calm, jiu jitsu on
U.S. Air Force Master Sgt. Ruben Rivas, head instructor, and Staff Sgt. Jacob Collins, assistant instructor, demonstrate a jiu jitsu move, July 27, 2015, at Aviano Air Base, Italy. The Wyvern Fitness Center hosts jiu jitsu classes from 5:30 to 7 p.m., Monday, Wednesday and Friday, for members age 14 and up. (U.S. Air Force photo by Senior Airman Areca T. Wilson/Released)