When you think your balls are larger than they really are, walking fire is employed. It's a sure way to be awarded the Silver Star. A Marine rifle squad will leap frog. Two fire teams advancing towards the objective . While one fire team advances the other fire team lays down suppresive fire. The first fire team advances so many yards then goes into the prone position laying down suppresive fire so the other fire team can advance and so on and so on.The third fire team maneuvers out of sight to attack the enemy position on it flank. Marching fire, also known as walking fire, is a military tactic; a form of suppressive fire used during an infantry assault or combined arms assault. Advancing units fire their weapons without stopping to aim, in an attempt to pin down enemy defenders. Marching fire usually ends with an infantry charge to engage the enemy in close combat. The tactic requires ample ammunition and rapid-fire weapons. It differs from fire and movement in that the attacking force advances in unison rather than leapfrogging forward in alternating groups. The BAR remained in U.S. service into the 1970's. During the Tet Offensive of 68 both Army and Marines called for BAR's and air cooled .30 cal Browning machine guns. Most were acquired from ARVAN but the Marines got them from the ship armories that were off shore. During Tet during the battle of Hue the Marines broke out the Thompson sub machine gun that were kept in armories but rarely issued except during Tet. During the battle of Hue the weapons of choice was the ONTOS the Thompson sub machine gun and the 12 ga. shotgun for clearing buildings. Until the early 70's all Marine ship detachments armories had Thompson sub machine guns, BAR's and some times water cooled Browning machine guns. The National Guard were still issued the BAR well into the 1970's. When the sh!t hits the fan, those obsolete WW ll weapons don't seem so obsolete.