World War II

Treacher was commissioned into the Royal Navy in 1942.^[2] As a midshipman, he served onboard the battleship HMS Nelson (28) and the Town-class cruiser HMS Glasgow (C21). He served onboard the Glasgow as part of Operation Neptune, (the Normandy landings) where she made up the Gunfire Bombardment Support Force C for Omaha Beach. Glasgow was hit and damaged during the operation.^[1]

Treacher subsequently served onboard the Thornycroft type destroyer leader HMS Keppel (D84), participating in the Arctic convoys. Promoted to sub-lieutenant, he joined the Black Swan-class sloop HMS Mermaid (U30).^[1]

Post-war career

Treacher volunteered to join the Fleet Air Arm and reported at RAF Booker in April 1947 for basic flying training. After attending advanced flying training at RAF Ouston, he was awarded his wings and reported to RNAS Lossiemouth. He joined the 800 Naval Air Squadron in March 1949. The squadron was part of the 13th Carrier Air Group embarked on HMS Triumph (R16). After the Amethyst incident, Triumph joined the Far East Fleet, headquartered at Singapore. During the Korean War, Treacher flew Supermarine Seafire and served as the Carrier Air Group Administration Officer.^[1]

After returning from the Far East, Treacher joined the 703 Naval Air Squadron, the Service Trials Unit (STU). After a short stint in 703 Squadron, he was selected to be trained in Airborne Early Warning (AEW) in the USA and on return, command the first AEW squadron of the Royal Navy. He trained at the Naval Air Station, Norfolk and the VAW-12 (then called VC-12) at the NAS Quonset Point. ^[3] The 778 Naval Air Squadron was commissioned on 5 November 1951 at RNAS Culdrose (HMS Seahawk) with Treacher as the commissioning squadron commander. The squadron transitioned from a training role to an operational role under him in July 1952, and became 849 Naval Air Squadron. He led the squadron during the Coronation review of the fleet in June 1953.^[1] After relinquishing command of 849 Squadron in July 1953, Treacher was appointed to the office of the Second Sea Lord and Chief of Naval Personnel, . However, after a short stint, he was appointed flag lieutenant and personal pilot to the Senior Naval Officer, British Joint Staff Mission, Vice Admiral Sir Geoffrey Barnard. Before taking the appointment up, he attended the staff course at the Royal Naval College, Greenwich.^[1]

After a three-year stint at Washington D.C., Treacher was appointed executive officer of the ice patrol ship HMS Protector (A146) in May 1956. During his tenure as XO, Protector rescued the passengers and crew of the icebound MV Theron, including Sir Edmund Hillary and Sir Vivian Fuchs. In 1957, he was appointed to the staff of Flag Officer, Flying Training (FOFT) at RNAS Yeovilton (HMS Heron). As staff officer, he was responsible for training of all front-line squadrons. After close to two years in the FOFT staff, he was appointed Commander (Air) of the Illustrious-class aircraft carrier HMS Victorious (R38), joining the ship on 21 May 1959. In March 1961, Treacher was appointed Head of the work-up team of the first aircraft carrier of the Indian Navy, INS Vikrant. He was charged with the introduction of aircraft carrier operations of the Indian Navy.^[1]

In September 1962, Treacher was appointed Naval assistant to the Third Sea Lord and Controller of the Navy, Vice Admiral Sir Michael Le Fanu. He served in this appointment for two years, after which he was appointed commanding officer of the Type-12 anti-submarine frigate HMS Lowestoft (F103). During his tenure as CO, Lowestoft transferred to the Far East fleet. In 1966, he led the ship during the Beira Patrol.^[1] He was promoted to captain in 1962 and went on to command HMS Eagle.^[1]

Flag rank

Treacher was promoted to the rank of Rear admiral and appointed Flag Officer, Carriers and Amphibious Ships (FOCAS) in July 1970.^[4] He served as FOCAS till June 1972, when he took over as Flag Officer Naval Air Command (FONAC). The appointments of Flag Officer, Flying Training and Flag Officer, Air (Home) were merged to form a single entity - FONAC. He was then appointed Vice Chief of the Naval Staff in 1973 and Commander-in-Chief Fleet in 1975. He was appointed Knight Grand Cross of the Order of the Bath in the 1975 Birthday Honours.^[5] He was promoted to admiral on 15 December 1975,^[6] and retired in March 1977.^[7]