Sign outside the Guardhouse at RAF Honington

I helped out at a bar for the Summer Ball at the Officers Mess and had to check in at the Guardhouse first. This notice caught my attention. 'Tesseral' means terrorist threat level. There are 5 levels from 'low' to 'critical'. Curiously 'Normal' doesn't appear in the list !

Two Extra photos of some redundant military equipment displayed on the base: there's also a plane at the entrance which may be a Tornado jet as this used to be a base for these planes. (It is now the home of the RAF regiment whose job is to protect airfields at home and abroad)