One new aspect of post war aviation, which was of interest to all three services, was the widespread use of helicopters. Accordingly, on 1 June 1961, the RAF element of the Helicopter Development Unit (HDU) was formed at Old Sarum, with a handful of early helicopter prototypes, Sycamores and Whirlwinds, to explore their military potential. In 1965 a new Joint Helicopter Development Unit (JHDU) was formed at Old Sarum and it immediately absorbed the former HDU, which became a section entitled 'Short Range Transport Development Unit'. In 1963 622 (Volunteer) Gliding School (VGS) became based at Old Sarum. The School of Land/Air Warfare was amalgamated with the Amphibious Warfare School from RM Poole in Dorset to form the Joint Warfare Establishment, equipped with a few Whirlwinds and Wessexes.