Yes. On 52 Sqn we used Saigon to refuel when returning to Seletar/Changi from Hong Kong and some crews stopped the night. It was uncomfortable there, knowing the VC probably had tunnels under where you were standing. Also I flew past Saigon during a 'busy' period (A quiet period was just manic) on the way to Phnom Pehn. Crew listened in to the tower controller. One thud was baulked on approach, requested a quickie radar and was told to eject!