RAF Transport Aircraft
 

I see that the game retires the latest RAF Hercules (C-130) aircraft in 2022. Not at all sure this will actually happen, since the SAS really does not like the larger Atlas A400M for covert drops.

And the Atlas is a lot larger (it can carry two partially disassembled Ajax, with another Atlas carrying the other parts, turret and add on armour packs. Ajax engineer/recovery varients can then assemble).

Current plan seems to be to keep one squadron of RAF Hercs for the forseeable future.

Info mainly from http://www.thinkdefence.co.uk/