Corporal Jendraszek was a member of Company C, 1st Battalion, 17th Infantry Regiment, 7th Infantry Division. He was listed as Missing in Action while fighting the enemy in North Korea on 10 July 1953. He was presumed dead on 11 July 1954. His remains were not recovered. His name is inscribed on the Courts of the Missing at the Honolulu Memorial.

Jendraszek was awarded the Purple Heart with Oak Leaf Cluster, 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.