make it almost useless. Concerns about the control fins at the front of the missile led to one of the distinguishing features of Blowpipe. It was considered to be a difficult problem to make movable control fins that also folded for storage so the decision was made to have the guidance fins unfoldable. This required the forward section of the launcher to be large enough to hold them in their flight positions, which leads to the seemingly oversized cylinder at the front of the launcher. The rear fins, used for stabilization only, are placed at the rear of this cylinder on a separate ring, and the missile flies through it until they reach the end of the fuselage where the ring locks into place. As they exit the tube, the tips of the rear fins fold out further. The programme immediately ran into problems. On 7 May 1969, Minister of Defence for Equipment Sir John Morris in Parliament claimed that the Blowpipe's development was "...proceeding satisfactorily but is at too early a stage for any firm production order." Two years later, on 11 February 1971, Minister of State for Defence Robert Lindsay noted that "The development programme for this missile continues to make progress although it will still be some time before it is completed. It would be contrary to normal policy to give detailed forecasts of the Forces' production requirements." On 16 March 1972, Under-Secretary for Defence for the Army Geoffrey Johnson-Smith said of Blowpipe "This is now in an advanced stage of development and some successful trials with it have been carried out. It, too, should be in service in about two years' time." A low-rate production contract was finally signed in September of that year. On 24 July 1973 it was stated that the system was still undergoing flight tests and ground tests, which were not officially completed until 1975. The missile entered service later that year. On 10 June 1976, further controversy sparked when it was revealed the Royal Air Force (RAF) was reluctant to use the weapon in test launches because of its high cost, limiting training to only two launches per year. By 1979, only half the units slated to receive Blowpipe actually had them. Variants After requests from the Israeli and Brazilian navies for a submarine-launched weapon, Blowpipe was developed in a cluster of six missiles on a mast that could be raised