It last operated the British Aerospace Hawk T1, providing 'aggressor' aircraft for air combat training from RAF Leeming in North Yorkshire, UK.

100 was established on 23 February 1917 at Hingham in Norfolk as the Royal Flying Corps' first squadron formed specifically as a night bombing unit and comprised elements of the Home Defence Wing.

[5] On 4 March 1918,[5] the squadron was sent to Ochey, near Nancy, to form the nucleus of the Independent Air Force under Major General Hugh Trenchard.

In August of that year, the unit converted to Handley Page 0/400 heavy bombers and therefore longer range sorties over industrial sites in Germany became possible.

[4] After the end of the war, the squadron remained on the continent until September 1919 as a cadre before transferring to RAF Baldonnel, near Dublin and re-forming to full strength, re-equipping with Bristol F.2 Fighters for army co-operation.

Following the end of hostilities the squadron was moved to Spitalgate, Lincolnshire in February 1922, and converted to bombing, this time with Vickers Vimys and DH9As.

In September of that year, the squadron took Hawker Horsley aircraft on complement and in November 1930 moved to Donibristle, Fife, converting to torpedo-bombing.

[6] A further re-equipment came in November 1932, when the Vickers Vildebeest came on complement and with this aircraft the squadron was deployed as part of the operation to defend Singapore, arriving at Seletar in January 1934.

[6] The squadron was put at readiness shortly after war was declared but, for the period to December 1941, there was little involvement operationally whilst still based at Seletar.

That night, 100 Squadron lost their commanding officer, David Holford, who crashed landed approaching RAF Grimsby.

It was disbanded on 1 September 1959 but re-formed at Wittering on 1 May 1962, equipped with Handley Page Victor B.2s, which, from early 1964, carried the Blue Steel missile nuclear weapon.

[10] Disbanded again on 30 September 1968, the squadron was re-formed as a target facilities unit in 1972, utilising Canberra aircraft at RAF West Raynham, in Norfolk.

100 Squadron has a degree of spare capacity in terms of its operations, it would take on an additional role of fast jet flying training.

The original flag disintegrated while being looked after by a Flight Lieutenant Trillwood during his time as a Japanese prisoner of war.