U.S. Marine Corps Lance Cpl. Blake Bowie, left, a rifleman assigned to the 1st Battalion, 5th Marine Regiment, Marine Rotational Force-Darwin, shows an Australian soldier how to fire an M4 carbine at Robertson Barracks in Northern Territory, Australia, April 15, 2014. Australian soldiers fired M4 carbines, M16A4 rifles and M27 Infantry Automatic Rifles and learned about proper use and care of the weapon systems while training with U.S. Marines assigned to the rotational force.