First Lieutenant Mayrand was a member of the 37th Field Artillery Battalion, 2nd Infantry Division. He was taken Prisoner of War while fighting the enemy near Kunu-ri, North Korea on 25 November 1950 and died while a prisoner on 16 February 1951.

Mayrand was awarded the Purple Heart, the Prisoner of War Medal, the Korean Service Medal, the United Nations Service Medal, the National Defense Service Medal, the Korean Presidential Unit Citation and the Republic of Korea War Service Medal.