U.S. Air Force Senior Airman Christopher Costa, right, assigned to the 374th Communications Squadron, shows Airman 1st Class Sentara Glover, serving with the 374th Logistics Readiness Squadron, a simple technique to escape the grasp of a would-be attacker during a My Strength is for Defending self-defense class in the natatorium at Yokota Air Base, Japan, April 23, 2009. Fourteen students learned jiujitsu-style self-defense as part of the base's Sexual Assault Awareness Month activities.