Some interesting details pertaining to that mentioned in the link at reply 23.
Camp Bastion, which is currently estimated to occupy an area similar to the town of Reading, is ringed by 30ft wire fences topped with triple concertina barbed wire. ...Large areas of the base are also protected by a 24 mile long, 30 ft high concrete blast wall interspersed with watch towers equipped with floodlights and manned by heavily armed, specially trained troops. ...The camp is located in the central Helmand desert and is completely isolated, with the exception of a few small farms close to the eastern perimeter. ...All approaches to the base are carefully monitored and the British protection force is equipped with a variety of surveillance devices and radar which should be able to identify any movement on the ground or in the air out to a range of 20 miles.
An air base with a 24mile perimeter wall and fence which is 30 ft tall?