Grunt Hero

It is a time for heroes, for killers, for Grunts. In this thrilling conclusion to the breakout military SF series, we find Earth plagued with millions of miles of terraformed cities, black vines crushing concrete, revealing iron and steel. Those unable to escape the vines are empty vessels waiting to be filled, living storage for alien algorythmic thought. What else can happen? What more can be done? This has always been a time for for heroes, for Killers, for Grunts, but are they enough? B...