Special Boat Service
(SBS) personnel prepare to board a plane during a parachute jump course. The SBS train in a range of parachute techniques including static-line, high altitude low opening (HALO) and high altitude high opening (HAHO). The SBS undergo the basic parachute course
at RAF Brize Norton as well as receiving HALO / HALO training from the Specialist Training Squadron there.
photo from wikimedia commons by user Zatoichi1564 | public domain | used with thanks