Private First Class Dewayne Thomas Williams (September 18, 1949 – September 18, 1968) was a United States Marine who posthumously received the Medal of Honor for heroism in the Vietnam War in September 1968. On September 18, 1968, Williams's 19th birthday, his unit participated in a patrol to destroy enemy sniper positions in Quang Nam Province. Suddenly, Williams's unit was ambushed by North Vietnamese forces. Williams was wounded early in the skirmish, but still attempted to fire back at the enemies. When a grenade came close to another Marine, Williams jumped onto it, sacrificing himself.