Marcom was enrolled at UNC from 1932 to 1934. He later was a representative of the U.S. Epperson Underwriting Co. of Kansas City, Mo., traveling throughout South Carolina and western North Carolina.

Marcom was a member of one of the three U.S. Marine divisions that made up III Corps of the 10th U.S. Army, which invaded Okinawa on April 1, 1945. Employing the attrition tactics that had made the conquests of Saipan, Pelelieu and Iwo Jima so difficult for the Americans, the Japanese provided only token resistance to the initial landings, husbanding their forces from the intense bombardment of the beaches during the landing to use them in prepared defensive positions later in the battle. III Corps swiftly overran the central and northern parts of the island, then was shifted to the south, where XIV Corps, composed of four U.S. Army divisions, had run into the heavily defended Shuri Line.

Marcom was killed in action on May 18, 1945, as III Corps participated in the assaults against the Japanese defensive positions along the Shuri Line.

Sources:
GAA Alumni Records;
www.answers.com/topic/battle-of-okinawa