still not fixed, about 4 missions out of 15 dont work, fortunately infinite ammo always work and it makes mortar & tank main gun fire rapidly, use ctrl manual aim and spam away, workaround/guide on the unsupported missions:
Viet mission 4: tank cant move need to repair track first, then use ctrl manual aim to blow up everything from distance
Viet mission 5: no cheap tricks available it seems, follow youtube guide/objectives along the trenches (you only need to move around about half size of the base), have 2 guys use throwing knife to silent kill pairs, once everything is rigged, get everyone in one of those machinegun bunker to avoid getting killed, friendly AI is pretty tough so dont worry about them
US mission 4: phase 1 use cheat engine manually scan and get infinite bombing, phase 2 either spam tank gun or scan for infinite reinforcement, using both over time crashes my game so just use tank gun
Bonus mission 4: 1st part stealth is hard, i used dynamite at the start to blow my team across the river to bypass, bridge has a specific spot for dynamite hover to find it, 2nd part stealth is easier, bush closest to helicopter can be used to hide without killing anyone in village, just need to time patrol route right to run back and forth undetected, tank convoy is easy just hide in between them, move around map edge
Bonus mission 5: turn off godmode as it works for enemy, spam tank autocannon from distance