Endless loop of combat 1.1

With story cards Your Name is Hank and your a soldier you find yourself at Resolution 1295 Call of Duty: Black Ops II and you get a pop-up saying wave one starts you see that you have a pistol with infinite ammo, but you have to reload it. You look around and see that there is silhouettes of weapons on the wall around the place, but they cost money when you shoot one enemy you get $1 and when you kill them, you get the full amount of $10 and there seems to be increasing value since their health is increasing every wave