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) - 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)

Marines with Combined Anti-Armor Team, 3rd Battalion, 2nd Marine Regiment, conduct patrols during a patrol training exercise at Camp Lejeune, N.C., Nov. 16, 2015. The unit practiced patrolling techniques both on foot and mounted in Humvees in preparation for their upcoming deployment to Okinawa, Japan. (U.S. Marine Corps photo by Lance Cpl. Brianna Gaudi/Released) - Marines with Combined Anti-Armor Team, 3rd Battalion, 2nd Marine Regiment, conduct patrols during a patrol training exercise at Camp Lejeune, N.C., Nov. 16, 2015. The unit practiced patrolling techniques both on foot and mounted in Humvees in preparation for their upcoming deployment to Okinawa, Japan. (U.S. Marine Corps photo by Lance Cpl. Brianna Gaudi/Released)

Marines with Weapons Company, 2nd Battalion, 2nd Marine Regiment, watch the impacts of rounds fired at a virtual target during training at the Indoor Simulated Marksmanship Trainer aboard Camp Lejeune, N.C., Aug. 5, 2015. The Marines practiced the fundamentals of marksmanship while firing on stationary and moving targets in a virtual battlefield. (U.S. Marine Corps photo by Cpl. Sullivan Laramie/Released) - Marines with Weapons Company, 2nd Battalion, 2nd Marine Regiment, watch the impacts of rounds fired at a virtual target during training at the Indoor Simulated Marksmanship Trainer aboard Camp Lejeune, N.C., Aug. 5, 2015. The Marines practiced the fundamentals of marksmanship while firing on stationary and moving targets in a virtual battlefield. (U.S. Marine Corps photo by Cpl. Sullivan Laramie/Released)