Seriously, what a nostalgia fest. Thanks for sharing.
1982 + 1983 Action Man was to blame for me not getting a bigger AF collection.
Looking at this I had the whole SAS collection (including the Chopper), that para really did work, I once attached one to a rotary clothes line, spun it round and watch him fly off and land safely
Also had the Space Ranger Captain (non talking sadly), a couple of the Ranger outfits, as well as Captain Zargon, now he could be a fun custom.
But comparing it the AF range I can spot the following cross overs:
SAS Trooper
SAS Beach Head Attack -
SAS Underwater Attack
SAS Parachute Attack
SAS Chopper Pilot
Parachute Regt
Deep Sea Diver
Frogman
Mountain & Arctic (to white AF9 figure)
Special Team arctic and desert outfits (even down to the fold up ladder)
Green Outfit Helicopter Pilot
The Space rangers are also very similar in concept to Space force, aside from colour changes, even down to the Commando having a plug in gun.
I suppose a good question would be which figure/vehicle/accessory from this range would you have liked to seen reproduced for AF?
For me it would have be the classic Action Man. Might be fun to build him, shame none of the Action Force figures came with green DPM trousers, I suppose the closest we could get to make one of those would be black DPM legs from the Z Force Sapper, with a repainted beret head. Not sure which body to use though.
Action Force STILL Needs You! 
for me id say the scorpion tank as i spent twelve years anoying farmers tearing up there fieldsin them and z force would have had the swifter attack vehicle backed up by mobat just to give the baron another headache
, black karate belt, and Victoria Cross...