[Sanjuro]

Don't get mixed up between the Grob 109 and 115. The Grob 109 is a motor glider- although you can fly along using the engine, it is intended to use the engine for takeoff, then switch off; the 109 is a pretty respectable sailplane, although it will not give as good a glide ratio as a dedicated modern sailplane. The 109 has been used by the Air Training Corps (RAF cadets, aged 13-21) and Combined Cadet Force (similar age group, affiliated to schools) since 1991.
The Grob 115, on the other hand, is a convenional aeroplane, designed to operate under power the whole time. It replaced the Bulldog (about which I have raved in a previous thread) in the University Air Squadrons (closest thing to AFROTC) in 1999; earlier in the 1990s the Air Experience Flights (also set up for ATC and CCF cadets to experience flight) were absorbed into the UASs when the deHavilland Chipmunks were retired.
Any of these aircraft could be found at either military or civil airfields in a T2k scenario; the advantage of the Grob 109 is that, as a motor glider, it uses far less fuel then the others- additionally, paint it pale grey and without engine noise to help track it, it is effectively invisible (and you thought your T2k campaign had no room for Stealth aircraft!).