1945 – UK
Westcott site was chosen by the UK Government to be the Guided Projectile Establishment. Its intention was to contain and develop all the knowledge and technologies associated with guided weapons and propulsion systems that were required by the British Royal Navy and Army at the time.

1949 – U.S.
Atlantic Research Corporation founded in Alexandria, Virginia.

1958 – UK
Westcott became the Rocket Propulsion Establishment, operating as an independent research and development establishment for the Government. During the next two decades, work continued using both solid and liquid propellant and resulted in the development of many projects, the most famous being Chevaline.

1959 – U.S.
First launch of Agena rocket with Bell liquid fluorine/liquid hydrogen second-stage rocket engine.

1960 – U.S.
Bell Aircraft defense business acquired by Textron. Bell Aerosystems Company created with headquarters in Buffalo, New York.

1960 – U.S.
First flight of manned Bell Rocket Belt (powered by hydrogen peroxide).

1965 – U.S.
Bell Aerosystems received contract to build advanced liquid propulsion system for Minuteman.

1984 – UK
The Rocket Propulsion Establishment came under the control of the Royal Ordnance Factories, and three years later the Government passed control to the private sector when British Aerospace purchased Royal Ordnance. The LEROS family of liquid propellant apogee engines and the bipropellant attitude control thruster (the LTT) were developed.

1987 – U.S.
Atlantic Research Corporation acquired by Sequa Corporation.

1987 – U.S.
Acquired liquid rocket product line of Bell Aerospace/Textron.