A Marine with 2nd Combat Engineer Battalion directs his weapon toward a second story window to provide cover fire for his fellow Marines in the Infantry Immersion Trainer aboard Camp Lejeune, N.C., Feb. 25, 2015.. The Infantry Immersion Trainer is a facility that prepares Marines and sailors for deployments and improves overall mission readiness. The facility offers an authentic village experience with realistic smells, sounds and live role-players.