There's no resource system.
However, your soldiers do not have unlimited "items", such as bullets, grenades, med-packs aso.
Also, the vehicles use fuel, which - judging from previous games in the series - is annoying since fuel is hard to find in the game.
Only problem here is that it'll probably give the enemy unl. fuel and ammo/items as well.
And to that, add rapid fire.....kinda hard to go at a tank when it's firing a shell every split second
This was a problem with trainers for the other games at least
And then there's ofcourse the health and stamina.