Marine Corps and Army faceoff during Hawaii exercise February 19 Marines with Bravo Battery, 1st Battalion, 12th Marine Regiment, fire a M777 155 mm howitzer during live-fire training as part of Rim of the Pacific (RIMPAC) exercise at Pohakuloa Training Area, Hawaii, July 17, 2018. (Lance Cpl. Adam Montera/Marine Corps) At one point 20 Marines and 20 soldiers ditched their cannons and fought each other. No, it wasn’t a turf war or a late night bar fight. It was on the South Range training area aboard the Schofield barracks on Oahu, Hawaii, within a simulated town as part of the exercise Steel Crucible, an Army-led exercise that saw Marines and soldiers fight against each other and work side-by-side in an island-hopping campaign against the fictional nation and near-peer threat called Torbia.