The AgustaWestland Apache is a licence-built version of the Boeing AH-64D Apache Longbow attack helicopter for the British Army. The first eight helicopters were built by Boeing; the remaining 59 were assembled by Westland Helicopters (now part of AgustaWestland) at Yeovil, England from Boeing-supplied kits. Changes from the AH-64D include Rolls-Royce engines, a new electronic defensive aids suite and a folding blade mechanism allowing the British version to operate from ships. The helicopter was named "WAH-64" by Westland Helicopters. It is designated Apache AH Mk 1 (or shortened to Apache AH1) by the UK's Ministry of Defence.