The soldiers begin firing, invisible lances cutting into the oncoming horde. A couple open up with Gauss cannons, spraying the approaching line and, for a few seconds at least, hiding it behind blinding plumes of nuclear fire. But they advance just the same; coming out of the detonations smoldering, red hot and completely undeterred. Those that fall are trampled beneath the charging horde, like stones vanishing under the surf. And thats what it is; a wave of flesh, an in sweeping tide of unnatural flesh and mindless aggression. You could swear that some of the fallen creatures are absorbed by their companions as they fall.
The Amp users, Big Helmet and the man whose memories these are, begin their work. They work in perfect unison to build walls of force; invisible corridors which trap and funnel the incoming tide; forcing it into a bottle neck and letting the soldiers unleash a targeted barrage. Nuclear tipped shells and landmines, cutting lasers, and plasma projectors, an unrelenting flow of high ordinance streams into the bottle necks. The world becomes so bright and loud, so blinding and unintelligible amongst the detonations and plasma, that the man's helmet filters it all out. His vision is black and the only sound is that of strangled breath as he tries to maintain the barrier. The team can feel the pain of it; the burning in his skull, the difficulty controlling himself, the sprays of nonsense math lighting his otherwise blinded vision. Finally, he can do it no longer.
He releases his hold and stumbles back, looking away from the battlefield. His visor undims, showing nothning but the ground as he stands, doubled over, leaning against the wall. Outside, the cacophony of the creatures is audible now. No roaring. No chittering. Just the sound of claws and bone and straining flesh, of tearing metal and breaking stone. Something slams into him and he looks up to see a soldier running from the bunker, back toward the base. Shuttles are taking off in droves and the other bunkers, those not already overrun, are retreating.
"Full evac. Full evac. Detonation in 100 seconds."