Cocoa extract and bodybuilding moves: How the Army is keeping Arctic troops warm 3 hours ago Sgt. Steven Calloway snowshoes across the tundra after conducting an airborne operation during exercise Arctic Pegasus in Deadhorse, Alaska, May 1, 2014. (Sgt. Edward Eagerton/Army) The Army is testing a “forearm heating device,” a cocoa bean and tea extract and a bodybuilding technique to keep hands and fingers warm in the extreme Arctic cold, where frostbite and other injuries are prevalent. The effort aligns with the Army’s release of its “Regaining Arctic Dominance” strategy in March, which announced plans to establish a two-star headquarters in Alaska that will manage Arctic-centric combat brigades.