Private Casas was a member of the 38th Infantry Regiment, 2nd Infantry Division. He was seriously wounded by the enemy in North Korea on 26 September 1951 and died of those wounds on 30 September 1951.

Casas was awarded the Purple Heart, the Combat Infantryman's Badge, 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.