[Zereth]

The current problem appears to be that crew simply aren't dying unless they lose life support/crew quarters. Apparently the marines are dying in combat, but the crew is invincibile.

So I'd guess setting it to 0 would have the battle rage on, with the crew unable to kill the marines due to being wimpy, while the marines being unable to kill the crew and thus take over due to the fact that the code for that simply doesn't work.