Major Seitzinger was the pilot of a F-84E Thunderjet fighter with the 7th Fighter-Bomber Squadron, 49th Fighter-Bomber Group. On 27 November 1951, while on a combat mission, he was strafing enemy rail facilities when he crashed into enemy boxcars. His remains were not recovered. His name is inscribed on the Courts of the Missing at the Honolulu Memorial.

For his leadership and valor, Major Seitzinger was awarded the Distinguished Flying Cross, the Air Medal with Oak Leaf Cluster with Oak Leaf Cluster, the Purple Heart with 2 Oak Leaf Clusters, 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.