- AEW version with SAAB "balance beam" radar.
- USAF version with fkyig boom receptacle replacing the probe (or in addition tothe probe)
- Tanker version fitted out to refuel multiple aircraft at one using multiple drogue units, including one o the aft ramp
- Gunship version
- Fire bomber using something siilar to the r-o/r-o system used by C-130's (If a DC-10 can be converted to a fire bomber, an 400M can be)
-- Purchase tech from Shin Meiwa for a flying boat version
- USAF version in Euro One camo scheme
- USAF version in retro SEA scheme
- RAF or USAF version in Middle eastern scheme.