Private First Class Hayen was a member of Company C, 1st Battalion, 5th Marines, 1st Marine Division. He was Killed in Action while fighting the enemy at "Nevada Cities" along the Western Outposts in Korea on 27 March 1953.

Hayen was awarded the Purple Heart, the Combat Action Ribbon, 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.