The President of the United States of America, under the provisions of the Act of Congress approved July 9, 1918, takes pride in presenting the Distinguished Service Cross (Posthumously) to Second Lieutenant (Infantry) Green Berry Mayo (ASN: 0-962708), United States Army, for extraordinary heroism in connection with military operations against an armed enemy of the United Nations while serving with Company B, 1st Battalion, 5th Cavalry Regiment (Infantry), 1st Cavalry Division. Second Lieutenant Mayo distinguished himself by extraordinary heroism in action against enemy aggressor forces in the vicinity of Omaegok, Korea, on 29 January 1951. While Lieutenant Mayo’s platoon was participating in an attack against a well fortified and determined enemy force on Hill 312, it was suddenly subjected to intense and accurate fire from two enemy machine-gun emplacements, forcing the men to take advantage of the little cover available to them on the side of the hill. Lieutenant Mayo immediately realized that it would be impossible to withdraw without suffering heavy casualties and yet, to remain in their present position would subject the men to threat of annihilation from grenades rolled down the slope by the enemy. Instructing his men to stay under cover, he scrambled from his position and moved forward to assault the enemy emplacements. Single-handedly. Charging directly into the heavy fire, he began to throw grenades rapidly at all of the enemy strongpoints visible to him. As he drew closer to the enemy positions, the hostile troops rolled numerous grenades into his path, one of which exploded and fatally wounded him. The extraordinary heroism displayed by Second Lieutenant Mayo on this occasion reflects the greatest credit on himself and is in keeping with the high traditions of the military service.