Vietnam War Medal of Honor Recipient. He received the award posthumously (presented to his family) from Vice President Spiro T. Agnew at the White House on September 15, 1971 for his actions as a lance corporal rifleman with the 1st Combined Action Group, 3rd Marine Amphibious Force, on May 8, 1970 at Quang Ngai Province, South Vietnam. He joined the US Marine Corps on 1969 and following his combat training, he was sent to South Vietnam. While participating in combat on May 8, 1970, he was mortally wounded in the action. He was also awarded the Purple Heart. His Medal of Honor citation reads: "For conspicuous gallantry and intrepidity at the risk of his life above and beyond the call of duty while serving as machine gunner with Combined Action Platoon 1-3-2, III Marine Amphibious Force, operating in Quang Ngai Province, Republic of Vietnam. During the early morning of 8 May 1970, Lance Corporal Keith was seriously wounded when his platoon was subjected to a heavy ground attack by a greatly outnumbering enemy force. Despite his painful wounds, he ran across the fire-swept terrain to check the security of vital defensive positions, and then, while completely exposed to view, proceeded to deliver a hail of devastating machine gun fire against the enemy. Determined to stop five of the enemy approaching the command post, he rushed forward, firing as he advanced. He succeeded in disposing of three of the attackers and in dispersing the remaining two. At this point, a grenade detonated near Lance Corporal Keith, knocking him to the ground and inflicting further severe wounds. Fighting pain and weakness from loss of blood, he again braved the concentrated hostile fire to charge an estimated twenty-five enemy soldiers who were massing to attack. The vigor of his assault and his well-placed fire eliminated four of the enemy while the remainder fled for cover. During this valiant effort, he was mortally wounded by an enemy soldier. By his courageous and inspiring performance in the face of almost overwhelming odds, Lance Corporal Keith contributed in large measure to the success of his platoon in routing a numerically superior enemy force, and upheld the finest traditions of the Marine Corps and of the United States Naval Service."