Korean War Medal of Honor Recipient. His mother posthumously received the award in 1952 during a ceremony at the Pentagon for his actions as a sergeant with Company B, 1st Battalion, 7th Marines, 1st Marine Division, at the Battle of the Punchbowl near Songnap-yongi, South Korea, on September 12, 1951. He enlisted in the US Marine Corps in June 1948 and following his basic training, he was stationed at Cherry Point and Camp Lejeune, North Carolina before being sent to South Korea in 1951 as part of the United Nations' military forces. In addition to the Medal of Honor, he received the Purple Heart (with one gold star) among others. 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 a Squad Leader in Company B, First Battalion, Seventh Marines, First Marine Division (Reinforced), in action against enemy aggressor forces in Korea on 12 September 1951. With his company pinned down and suffering heavy casualties under murderous machine-gun, rifle, artillery and mortar fire laid down from heavily fortified, deeply entrenched hostile strongholds on Hill 673, Sergeant Mausert unhesitatingly left his covered position and ran through a heavily mined and fire-swept area to bring back two critically wounded men to the comparative safety of the lines. Staunchly refusing evacuation despite a painful head wound sustained during his voluntary act, he insisted on remaining with his squad and, with his platoon ordered into the assault moments later, took the point position and led his men in a furious bayonet charge against the first of a literally impregnable series of bunkers. Stunned and knocked to the ground when another bullet struck his helmet, he regained his feet and resumed his drive, personally silencing the machine-gun and leading his men in eliminating several other emplacements in the area. Promptly reorganizing his unit for a renewed fight to the final objective on top of the ridge, Sergeant Mausert boldly left his position when the enemy's fire gained momentum and, making a target of himself, boldly advanced alone into the face of the machine gun, drawing the fire away from his men and enabling them to move into position to assault. Again severely wounded when the enemy's fire found its mark, he still refused aid and continued spearheading the assault to the topmost machine-gun nest and bunkers, the last bulwark of the fanatic aggressors. Leaping into the wall of fire, he destroyed another machine-gun with grenades before he was mortally wounded by bursting grenades and machine-gun fire. Stouthearted and indomitable, Sergeant Mausert, by his fortitude, great personal valor and extraordinary heroism in the face of almost certain death, had inspired his men to sweep on, overrun and finally secure the objective. His unyielding courage throughout reflects the highest credit upon himself and the United States Marine Corps. He gallantly gave his life for his country."