Dyess was appointed a first lieutenant in the Marine Corps Reserve in November 1936 and was assigned to 19th Battalion, a reserve unit in Augusta, Georgia. In 1937, 1st Lt. Dyess was awarded the bronze star as a shooting member of the Marine Corps Rifle Team, which won the Hilton trophy in the National matches, and was given the same award in 1938 as an alternate member of the team that captured the Rattlesnake trophy in the matches.
On February 1, 1944, the day preceding Dyess's death, six U.S. Marine snipers were on patrol on Namur Island where Japanese forces had taken up protected positions following the Battle of Kwajalein. The Marine patrol had inadvertently moved behind enemy lines, surrounded on three sides by Japanese forces, where they came under small arms fire from a concealed position. One of the Marines was killed instantly, and four of the remaining five Marines sustained injuries from the attack. One of the injured Marines, Cpl. Frank Pokrop, later recalled, “with no protection and heavy fire coming at us from a few feet away and dusk approaching, we were certain to be killed. All of a sudden Col. Dyess broke through on the right, braving the very heavy fire, and got all of us out of there."[3]
Lieutenant Colonel Dyess was killed on February 2, 1944, by a burst of enemy machine gun fire while standing on the parapet of an anti-tank trench directing a group of infantry in a flanking attack against the last Japanese position in the northern part of Namur Island. In this final assault, Dyess posted himself between the opposing lines and, exposed to fire from heavy automatic weapons, led his troops in the advance. Wherever the attack was slowed by heavier enemy fire, he quickly appeared and placed himself at the head of his men and inspired them to push forward.
Dyess was initially buried in the 4th Marine Division cemetery on Roi-Namur Island, Kwajalein Atoll, Marshall Islands. In 1948, he was re-interred in Westover Memorial Park Cemetery, Augusta, Georgia.[4]
