Looks like DUWS, not sure which version. There's a version of DUWS that uses the RH US and Russian mod that includes a mission where you have to steal a mini sub.....by lifting it from wherever it is with a helicopter, and from then on you can use the sub.
Antistasi is a whole island mission like DUWS except the enemy bases are in fixed locations and you can't buy weapons and ammo, etc, you have to steal it. Antistasi seems to have a lot more enemy patrols to encounter than DUWS but the mission generation depends on your progress, eg at the start you'll be doing guerilla hit and run raids, supply runs, assassination missions, etc.....and once you've established a decent level of supply you'll start getting capture missions, anti-armour, etc. And the enemy counter attacks are just awesome. The enemy supply simulation is also pretty good, it's possible to destroy enough enemy vehicles that they can't afford to buy any more for a while.
http://forums.bistudio.com/showthread.php?187914-SP-CO8-A-3-Antistasi-AltisLemme know if you're gonna try it...