In 1965, Operation Rolling Thunder roars across the skies over North Vietnam and the first U.S. ground troops land in the South. American soldiers are outnumbered in the Ia Drang Valley, the first major battle of the war.

The enemy gains ground when the massive Tet Offensive catches the Americans by surprise. At Khe Sanh and Pleiku, U.S. troops are under siege. Americans mount a counteroffensive but the shock of the assault ignites anti-war fervor at home.