Hawker Siddeley Harrier as VTOL and STOL manoeuvres (where the traditional lift and control surfaces are useless) requiring skills and technical knowledge usually associated with helicopters. Most services demand great aptitude and extensive training for Harrier pilots, as well as experience in piloting both types of aircraft. Trainee pilots are often drawn from highly experienced and skilled helicopter pilots. In addition to normal flight controls, the Harrier has a lever for controlling the direction of the four vectoring nozzles. It is viewed by senior RAF officers as a significant design success, that to enable and control the aircraft's vertical flight required only a
Hawker Aircraft it merged with the engine and automotive company Armstrong Siddeley and its subsidiary, Armstrong Whitworth Aircraft, to form Hawker Siddeley Aircraft. This group also encompassed A. V. Roe and Company (Avro). Hawker Aircraft continued to produce designs under its own name as part of Hawker Siddeley Aircraft, from 1955 a division of Hawker Siddeley Group. The "Hawker" brand name was dropped, along with those of the sister companies, in 1963; the Hawker P.1127 was the last aircraft to carry the brand. The Hawker legacy was maintained by the American company Raytheon who produced business jets (including some derived from the