BEIJING, May 18 -- An air force unit under the PLA Southern Theater Command recently engaged in a Red vs. Blue confrontational drill involving aviation, ground-to-air missile and radar troops. The red army - the offensive side - sent several warplanes, guided by early warning aircraft, to launch stealthy strikes on key targets of the blue army. While the blue army - the defensive side consisting of aviation, ground-to-air missile and radar troops, set up a three-dimensional defense network to fight back the red army's surprise attacks.