Though the artifices of evil are many, a bolter round kills just as assuredly.
— Inquisitor Skorn, Warhammer 40,000
Three or four troopers will fire thousands of rounds into a Bug, which like the Energizer Bunny just keeps on comin'. Grenades work better, but I guess the troopers haven't twigged to that. You'd think a human race capable of interstellar travel might have developed an effective insecticide, but no.