due to the co-operative development and production aspects proposed for the programme, which spread work across a number of member nations. Protracted political maneuvering by firms and national governments alike was deployed in attempts to secure their respective project's selection. The P.1154 was ultimately selected to meet NBMR-3, but this did not lead to orders being placed. The French government subsequently withdrew from participation once the Dassault design lost. NATO lacked any central budget, relying on individual member nations to actually procure military equipment, and the NBMR-3 selection went unheeded by all of these nations. Thus, in 1965, the whole project was terminated. RAF and Royal Navy requirements On 6 December 1961, prior to the design being submitted to NATO, it was decided that the P.1154 would be developed with the requirements for use by both the RAF and the Royal Navy. In February 1962, the Royal Navy's Admiralty received the aircraft concept with great interest as the Royal Navy was in the process of seeking a new interceptor aircraft for use on their aircraft carriers at the time. By March 1962, the Ministry of Defence was openly interested in the potential for the P.1154 being adopted as a replacement for both the RAF's fleet of Hawker Hunters and the Royal Navy's de Havilland Sea Vixens. Accordingly, in April 1962, a first draft of a new joint Naval/Air Staff requirement was issued in the form of Specification OR356/AW406, to which HSA had submitted a response by June of that year. Following the cancellation of the NBMR-3 requirement, HSA focused all its attention onto working upon this joint requirement. The services sought different characteristics in their aircraft – the RAF desired a single-seat fighter with secondary intercept capability, while the Fleet Air Arm (FAA) sought a two-seat interceptor capable of secondary low-level strike capability. Accordingly, HSA's submission involved the development of two distinct variants of the same P.1154 aircraft, each aimed towards a particular service and its stated requirements. Although financially and politically committed to a joint requirement with the Royal Navy, the RAF's single-seat design took precedence over the two-seat version of the Royal Navy. However, RAF P.1154s would have to accommodate the Navy's large airborne intercept (AI) radar. When HSA submitted the design on 8 August, the Royal Navy criticised the proposal, which had a tandem undercarriage layout incompatible with catapult operations; consequently, a tricycle undercarriage design was investigated