Career
Gammon joined the Army from Roanoke, Virginia in March 1942, and by January 11, 1945 was serving as a Staff Sergeant in Company A, 9th Armored Infantry Battalion, 6th Armored Division. On that day, near Bastogne, Belgium, he destroyed a German machine gun position before beginning a one-man assault on a Tiger Royal tank. He silenced a supporting machine gun emplacement and killed two infantrymen before he was killed by a shot from the tank.
Gammon, aged 26 at his death, was buried in Mountain View Cemetery, Danville, Virginia.
By his intrepidity and extreme devotion to the task of driving the enemy back no matter what the odds, The USAT Sergeant Gammon which served the United States Army at the end of World World War II was named in his honor.