Marines who encounter roadside bombs and respond appropriately now are eligible for the Combat Action Ribbon, according to the Marine Corps. The ribbon was and still is awarded to Marines who performed satisfactorily in a firefight or under enemy fire, said Marine Corps Commandant Gen. Michael Hagee in a Marine Corps announcement. But warfare has evolved to include a new threat — roadside bombs, also known as improvised explosive devices — Hagee said. As of Feb. 25, such devices have killed 927 U.S. troops in Iraq — about 52 percent of hostile deaths — and wounded 9,549 troops — about...