Officer Candidates School candidates assemble M16A2 service rifles as part of the RS Twin Cities 2014 Mini-Bootcamp. The OCS candidates and poolees from Minnesota, Wisconsin and the Dakotas learned the operational and safety features of the weapon as part of their training. - Officer Candidates School candidates assemble M16A2 service rifles as part of the RS Twin Cities 2014 Mini-Bootcamp. The OCS candidates and poolees from Minnesota, Wisconsin and the Dakotas learned the operational and safety features of the weapon as part of their training.