Career
Cassidi joined the Royal Navy in 1938. He served in HMS Cumberland and HMS Hardy with the Iceland Patrols and Russian Convoys during World World War II and also took part in the Normandy landings. He became Commanding Officer of 820 Naval Air Squadron in 1954 and of HMS Whitby in 1960.
He went on to be Assistant Director of Naval Plans (Warfare) in the Ministry of Defence in 1964 and Commanding Officer of HMS Undaunted as well as Captain of the 2nd Frigate Squadron in 1967.
In 1970 he returned to the Ministry of Defence as the Director of Naval Plans. He became Commanding Officer of HMS Ark Royal in 1972 and Flag Officer Aircraft Carriers and Amphibious Ships in 1974.
He went on to be Director-General Naval Manpower and Training in 1975 and Flag Officer Naval Air Command in 1978. He then became Second Sea Lord and Chief of Naval Personnel in 1979 and Commander-in-Chief Naval Home Command in 1982.
He retired in 1985. He lives near Langport in Somerset.
