While serving as commander of
1st Battalion, 502nd Parachute Infantry Regiment in the
Battle of Carentan,
Lieutenant Colonel Cassidy was awarded the
Distinguished Service Cross. During the
Battle of Bastogne, he served as executive officer of the 502nd Parachute Infantry Regiment. In 1963,
Brigadier general Cassidy commanded
XVIII Airborne Corps.
Major general Cassidy commanded the
8th Infantry Division from April 1966 to June 1968. In August 1967, he was awarded the
Military Medal,
Luxembourg's highest military honor. He served as Chief of Personnel Operations from February 1968 to June 1969.
Lieutenant general Cassidy served as commander of
I Corps from 8 August 1969 to 26 July 1970. In October 1971, he was appointed commander of
Fifth United States Army. In January 1973, he acted as commander of escorts for the memorial service for former
President Harry S. Truman at
Washington National Cathedral. ==References==