Marines from Headquarters and Service Company, 4th Assault Amphibian Battalion, 4th Marine Division, demonstrate the basic weapons system operations to members of the Employer Support of the Guard and Reserve on March 2, 2018, in Tampa, Fla. Marines from 4th AAVs spent the day with members of the Employer Support of the Guard and Reserve foundation demonstrating their capabilities as a Battalion and teaching basic weapons system operations, basic combat lifesaving skills and showing how the Amphibious Assault Vehicle operates.