I hate to sound harsh you REALLY need to actually study something before you 'make' something. 1939 didn't have suicide bombers or rpg's or helicopters or heavy tanks or quite frankly anything in here. Seriously study some history at least an ounce.
i second that
you should know what the next level objective is going to be, so you can upgrade the units you will need the most. also, when you have to restart the mission, you should get back your upgrade points so you can relocate them and choose other upgrades.
first mission with the hostage and the truck: i killed all enemies, but just as the truck went off the screen, a new wave of enemies appeared, so i did not get the points. sucks balls.
i think many of our problems would be solved if we got MORE TACTICAL POINTS MORE OFTEN. i also had 6 men in the third wave, all walking over like nobody was there.
this game was not thought trough. it was a very big undertaking, but it needs a few more years to totally clean this up - and by then you could probably make money of it. i hope the developer reads all these comments.