It is Spring in America. By 1972 the war in Vietnam is winding down. At least that's what everyone thinks. Sergeant Mike Corbett volunteers to retrieve classified weapons from a remote Post in the Northern Province of QuangTri. The Americans are leaving. But the Vietnamese Communists aren't waiting. Corbett is caught up in the massive Easter offensive; on the ground before Military Intelligence realizes the scope of the enemy offensive. A few hundred Americans, mostly technicians, are stranded in the middle of Indian Country. Boogieman's out there; thousands of them. The Americans hold their ground and plan a defense. Their Special Weapons are useless in a firefight, so they are left with the same M-16 as any grunt. Evacuation is not feasible. At stake are Weapons Specialists and weapons components so sensitive that the alternative to overrun is Emergency Demolition. The Big Bang. The greatest fear is that a South Vietnamese collapse will leave the isolated Americans as virtual hostages. March 1973 the last U.S. troops will officially leave Vietnam. Corbett faces 365 and a wake-up. This is the Lost Battalion of the Vietnam War.