Lyneham Lad
Could you elaborate on what you mean by politics affecting categories? I was always of the opinion that, as you state, the difference between 3 and 4 is down to an MU being able to repair as opposed to a civilian organisation/manufacturer? I don't see where politics comes into it.
Clearly S_H you have rattled TSM's cage somewhat! What did you say? From the Monkeys comments it must have been something pretty serious!
As for the AWACS, I too am not an expert, but I would have thought cat4 myself, if for no other reason than Mr Boeing will be wanting to fix the aircraft correctly and properly. That said, the bill from him will be astronomical, and if Joe Bloggs down the road will do for a bit less, chances are he'll get the job!
The Winco