As communist forces close in on the isolated Marine outpost at Khe Sanh, the 1968 Tet Offensive explodes across Vietnam. Shot down in Hue City while scouting for bases to move the 1st Air Cavalry to break the siege, U.S. Navy Seabee Officer Kevin Corcoran takes shelter with South Vietnamese holdouts. Intense enemy fire drives off rescue helicopters, leaving Kevin and a wounded friend isolated in Vietcong territory. As battle rages around him, Kevin...