Hypergenetic Bio-Armor

'Soldiers of the Stellar League, this is your most implacable foe. It's not an alien of any sort, but rather the genetically augmented and armored forces of Medigen Industries. Their armor is composed of multiple living things, with rapid regenerative capabilities, and living in a symbiotic relationship with the soldier inside. Even the biocannons fire living ammunition, a swarm of voracious, razor-toothed mites propelled by muscular contraction. The chitinous claws allow them to slice through steel like tissue paper, and physical contact with the undersuit itself unleashes a powerful electrical charge.'

A lone soldier raised his hand. 'Sir, if they're that rough, why don't we just nuke 'em?'

'Son,' answered the Drill Instructor, 'ever hear of cockroaches?'