Inert grenades (dummy), non-exploding practice tools, sit on a table where Marines with 2nd Law Enforcement Battalion will pick them up before taking part in an assault course with grenade training at Marine Corps Base Camp Lejeune, N.C., March 16, 2016. This drill is part of an annual training event to prepare them for combat situations when they are called upon to deploy. Marines took turns providing cover fire for their partner, allowing them to throw a dummy grenade near the simulated enemy position. - Inert grenades (dummy), non-exploding practice tools, sit on a table where Marines with 2nd Law Enforcement Battalion will pick them up before taking part in an assault course with grenade training at Marine Corps Base Camp Lejeune, N.C., March 16, 2016. This drill is part of an annual training event to prepare them for combat situations when they are called upon to deploy. Marines took turns providing cover fire for their partner, allowing them to throw a dummy grenade near the simulated enemy position.