Third-generation warfare focuses on using speed and surprise to bypass the enemy's lines and collapse their forces from the rear. Essentially, this was the end of linear warfare on a tactical level, with units seeking not simply to meet each other face to face but to outmaneuver each other to gain the greatest advantage.
“Unmanned Systems Roadmap: 2007-2032”, Office of the Secretay of Defense (10 December 2007) — the report (12 meg PDF). “This roadmap provides Defense-wide vision for unmanned systems and related technologies. The Department will continue … updating it as transformational concepts emerge. Unmanned systems wil continue to have a central role in meeting our country’s diverse security needs, especially in the Global War on Terrorism.”