SAVE GAME issue:
If you have experienced the save game issue, please read this topic:
Arma 3 BUG Tracker[feedback.arma3.com]
You can find the BUG cause there and also some workarounds.

REGROUP ISSUE:
When AI doesn't regroup correctly it is an Arma 3 issue, please check the solution here:
http://forums.bistudio.com/showthread.php?102905-How-to-get-AI-to-regroup-when-they-decide-to-follow-some-one-else&p=1683777&viewfull=1#post1683777

INVENTORY ISSUE:
http://feedback.arma3.com/view.php?id=4252

REARM FIX,
Due to the issues with the Rearm Bug, the rearm button is now out. There are two gear boxes at the Olympus Air Base, one with Hunter Six gear stored and an empty one, to put in the gear that is not needed at the moment.

FOG ISSUE:
the fog is pure arma 3 and the scenario deosn't modify it at all. You can probably get rid of the fog using console commands. Check this link:
https://community.bistudio.com/wiki/setFog