Spc. Dijon Moore, a Chemical, Biological, Radiological, Nuclear specialist with the 230th Engineer Battalion, attempts an arm-bar while grappling with his partner, Spc. Jackson Leach during a jiu-jitsu class at the Camp Arifjan gym, Oct. 25, 2011. Many soldiers participate in the class for jiu-jitsu's physical benefits, as well as its close relation to Modern Army Combatives.