For conspicuous gallantry and intrepidity in action at the risk of his life above and beyond the call of duty. Capt. Rubio, Infantry, was serving as communications officer, 1st Battalion, when a numerically superior enemy force launched a massive attack against the battalion defense position. Intense enemy machinegun fire raked the area while mortar rounds and rifle grenades exploded within the perimeter. Leaving the relative safety of his post, Capt. Rubio received 2 serious wounds as he braved the withering fire to go to the area of most intense action where he distributed ammunition, re-established positions and rendered aid to the wounded. Disregarding the painful wounds, he unhesitatingly assumed command when a rifle company commander was medically evacuated. Capt. Rubio was wounded a third time as he selflessly exposed himself to the devastating enemy fire to move among his men to encourage them to fight with renewed effort. While aiding the evacuation of wounded personnel, he noted that a smoke grenade which was intended to mark the Viet Cong position for air strike was close to the friendly lines. Capt. Rubio ran to reposition the grenade but was immediately struck to his knees by enemy fire. Despite his several wounds, Capt. Rubio scooped up the grenade, ran through the deadly hail of fire to within 20 meters of the enemy position and hurled the already smoking grenade into the midst of the enemy before he fell for the final time. Using the repositioned grenade as a marker, friendly air strikes were directed to destroy the hostile positions. Capt. Rubio's singularly heroic act turned the tide of battle, and his extraordinary leadership and valor were a magnificent inspiration to his men. His remarkable bravery and selfless concern for his men are in keeping with the highest traditions of the military service and reflect great credit on Capt. Rubio and the U.S. Army.