Under the GGC, the Hunters ROTC (Reserve Officers Training Corps) guerrillas, made up originally of former cadets of the Philippine Military Academy along with some former ROTC and college students under the command of Col. Frank Quesada were one of the most active groups. Other formations include President Quezon's Own Guerrillas (PQOG) under Col. Fil Avanceña, Red Lion's Unit, the Filipino-Chinese 48th Squadron and the Villegas group of the Hukbalahaps were tasked by the GGC to coordinate operations related to Los Baños.