Vietnam veteran and retired Marine major, John Fasulo, gives a class to Marines with 3rd Battalion, 2nd Marine Regiment, during a Deployment for Training exercise at Fort A.P. Hill, Va., Jan. 29, 2016. The class covered the nomenclature and effectiveness of multiple land mines used in combat throughout history. He also shared his Vietnam War experiences to showcase the importance of understanding different weapon systems before the Marines deploy to an overseas environment. (U.S. Marine Corps photo by Lance Cpl. Samuel Guerra/Released)

Photo by Lance Cpl. Samuel Guerra