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U.S. Air Force Staff Sgt. Christopher Costa, top, 51st Communications Squadron radio frequencies transmissions systems supervisor, demonstrates a submission move on Staff Sgt. Devin Fields, 607th Support Squadron NCO in charge Kunsan element, during a Brazilian jiu-jitsu class at Osan Air Base, Republic of Korea, Nov. 21, 2016. Costa prepared and trained Airmen that participated in the Dumau Jiu-Jitsu Korea Grand Prix 2016 in Seoul on Nov. 27, 2016. (U.S. Air Force photo by Staff Sgt. Jonathan Steffen)


Osans Airmen train, compete in Jiu-jitsu tournament

U.S. Air Force Staff Sgt. Christopher Costa, top, 51st Communications Squadron radio frequencies transmissions systems supervisor, demonstrates a submission move on Staff Sgt. Devin Fields, 607th Support Squadron NCO in charge Kunsan element, during a Brazilian jiu-jitsu class at Osan Air Base, Republic of Korea, Nov. 21, 2016. Costa prepared and trained Airmen that participated in the Dumau Jiu-Jitsu Korea Grand Prix 2016 in Seoul on Nov. 27, 2016. (U.S. Air Force photo by Staff Sgt. Jonathan Steffen)

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Staff Sgt. Jonathan Steffen
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