Here’s the complete MiG-21 MF in Bulgarian Air Force service from the late 90s at the then-still-active Dobrich AFB. This particular machine has been overhauled in 1996, it has possibly been rewired to use a recce container since the MiG-21R versions were no longer flying. This local modification is known as the MiG-21 MFR. A total of 7 conversions were made.
The AT-T (Russian “Artilleriyskiy Tyagach – Tyazholiy”, Artillery Tractor – Heavy) was developed in the late 1940s using elements of the T-54 MBT (notably the running gear).
The main purpose of the vehicle was to tow heavy artillery pieces like the KS-30 130mm AA gun, the S-23 180mm gun and the B-4 203mm howitzer, so the machine got a 415HP version of the famous B-2 V-12 tank diesel. The standard 5-roadwheel chassis was used for a number of recovery and engineering vehicles. Extended versions (7 roadwheels) include the P-40 „Long Track” mobile radar, and an entire family of polar expedition vehicles.