|Unit||L CO 8 REGT 1 CAV DIV|
|Rank||Master Sergeant U.S. Army|
|Date of Death||November 2 1950|
|Status||Missing In Action|
Courts of the Missing
European-African-Middle Eastern Campaign Medal
Korean Service Medal
National Defense Service Medal
Republic of Korea Presidential Unit Citation
Republic of Korea War Service Medal
United Nations Service Medal
World War II Victory Medal
Combat Infantryman Badge
For his leadership and valor, Master Sergeant Costello was awarded the Bronze Star with 2 Oak Leaf Clusters, the Purple Heart, the Combat Infantryman Badge, the Korean Service Medal, the United Nations Service Medal, the National Defense Service Medal, the Korean Presidential Unit Citation, the Republic of Korea War Service Medal, the European Theater of Operations Medal and the World War II Victory Medal.
Master Sergeant Costello was a veteran of World War II, landing at Anzio, Italy. In Korea, he was a member of Company L, 3rd Battalion, 8th Cavalry Regiment, 1st Cavalry Division. He was Killed in Action while fighting the enemy near Unsan, North Korea on November 2, 1950. His remains were not recovered. His name is inscribed on the Courts of the Missing at the Honolulu Memorial.