Insignia trilogy

Tom, a fourteen-year-old genius at virtual reality games, is recruited by the United States Military to begin training at the Pentagonal Spire as a Combatant in World War III, controlling the mechanized drones that do the actual fighting off-planet.

"Tom Raines and his friends return to the Spire for their third year as superhuman government weapons, but the rules have been changed and Tom's training is put to the test"--