No 21 Argosy Course, airdrop phase in summer 1966. A trainee Nav, the late and very tall Andy McHugh, was on a 1-Ton drop at Tangmere. He called 'Green On' when required, the load moved and extracted ..... but the main chutes malfunctioned and did not open, causing the pallet full of ammo boxes filled with gravel to make a neatly shaped hole on the runway.