I'm at the end of Mission 2 and I have no more ammo. What am I supposed to do now? I have to shoot cameras and stuff to advance. Am I stuck here forever?

start again.you need to take your time shoot out cameras switch off lights.sneak behind guards hide bodies.the level is not hard.stay in the dark take your time.a medpack is available on top of stairs on first floor stairwell and satchel when you knock out colonel.