The British Army purchased 113 Corporal missiles from the United States in 1954. It was intended that they would be equipped with British warheads under a project codenamed Violet Vision, but Project E offered a quicker, simpler and cheaper alternative. The US supplied 100 W7 warheads, which had to be drawn from US Army storage sites in southern Germany until arrangements were made for local storage in August 1959. A British missile, Blue Water, with an Indigo Hammer warhead, was developed to replace Corporal. The US offered the Honest John missile as an interim replacement. The offer was accepted, and 120 Honest John missiles with W31 warheads were supplied in 1960, enough to equip three artillery regiments. Blue Water was cancelled in July 1962, and Honest John remained in service until 1977, when it was replaced by the Lance missile. The British Army deployed more US nuclear weapons than the RAF and Royal Navy combined, peaking at 327 out of 392 in 1976–1978.