New weapons for the infantry are tested at Aberdeen, Maryland. At the army's proving ground, the multi-purpose standard rifle and machine gun combine to replace 7 earlier weapons as demonstrated by their power. A soldier is demonstrating the new standard rifle with an interchangeable barrel. MCUS - Soldier laying on his stomach shooting a file. MCUS - Another soldier has a rifle in his hands that's a M-14 and when he pulls the trigger, it fires automatically. MCUS - A soldier is standing by the new M-60 sub-machine gun that's on a stand. It has three interchangeable barrels the M-60 takes the place of three earlier guns.