1/17/2013 - Airmen from the 321st Special Tactics Squadron spar with each other Jan. 11, 2013, at RAF Mildenhall, England. The Airmen train regularly to keep their already-learned skills sharp. (U.S. Air Force photo by Airman 1st Class Kelsey Waters/Released)

1/17/2013 - A combatives instructor demonstrates a knife technique on an Airman from the 321st Special Tactics Squadron Jan. 11, 2013, at RAF Mildenhall, England. The Airmen receive training regularly to keep their skills up-to-date. (U.S. Air Force photo by Airman 1st Class Kelsey Waters/Released)

1/17/2013 - Airmen from the 321st Special Tactics Squadron train in knife skills Jan. 11, 2013, in building 539 at RAF Mildenhall, England. The Airmen train regularly to keep their skills sharp. (U.S. Air Force photo by Airman 1st Class Kelsey Waters/Released)

1/17/2013 - Airmen from the 321st Special Tactics Squadron grapple with each other Jan. 11, 2013 at RAF Mildenhall, England. The 321st STS Airmen receive this training regularly to keep their current skills sharp. Additionally, the course trains the operators on different techniques which can both save their lives and effectively diffuse potentially risky situations. (U.S. Air Force photo by Tech. Sgt. Stacia Zachary/Released)

1/17/2013 - Airmen from the 321st Special Tactics Squadron practice knife techniques Jan. 11, 2013 at RAF Mildenhall, England. The 321st STS Airmen receive this training regularly to keep their current skills sharp. Additionally, it trains the operators on the different techniques available which can both save their lives and effectively diffuse potentially risky situations. (U.S. Air Force photo by Tech. Sgt. Stacia Zachary/Released)

1/17/2013 - Airmen from the 321st Special Tactics Squadron train with each other Jan. 11, 2013 at RAF Mildenhall, England. The 321st STS Airmen receive this training regularly to keep their current skills sharp. Additionally, it trains the operators on different techniques which can both save their lives and effectively diffuse a potentially risky situation. (U.S. Air Force photo by Tech. Sgt. Stacia Zachary/Released)

1/17/2013 - A combatives instructor demonstrates knife techniques to Airmen from the 321st Special Tactics Squadron Jan. 11, 2013 at RAF Mildenhall, England. The 321st STS Airmen receive this training regularly to keep their current skills sharp. Additionally, it trains the operators on different techniques which can both save their lives and effectively diffuse a potentially risky situation. (U.S. Air Force photo by Tech. Sgt. Stacia Zachary/Released)