I mean, you recover them... FROM ENEMIES, for one. You're telling me that Monsters just happen to have a fully-loaded flare gun with them, and never use it. Even if they ate it, it still works.
And along the lines of that, how the heck are Recon Rangers even supposed to see a Flare all the way inside a giant plant? Do they have super-man like powers? And what about Artillery Strikes? Where do the missiles even come from? Are they just randomly hanging from the ceiling?
I NEED ANSWERS.
Recon Rangers are always watching. And artillery strikes... have you never heard of laser-guided missiles?