A revetment, in military aviation, is a parking area for one or more aircraft that is surrounded by blast walls on three sides. These walls are as much about protecting neighbouring aircraft as it is to protect the aircraft within the revetment. If a combat aircraft fully loaded with fuel and munitions was to somehow be set on fire, by accident or design, then it could start a chain reaction, as the destruction of individual aircraft could set ablaze its neighbours. The blast walls around a revetment are designed to channel blast and damage upwards and outwards away from neighbouring aircraft.