The Guerilla Tactics Training Camp provides a place for Ninja Monkeys to hone their less than honorable skills in destroying and damaging the Bloons [sic] supply lines.
~ Official BMC description

The Guerilla Tactics Training Camp, called Guerilla Training Camp in the Mobile version, is a Special Building that is required for the Sabotage Supply Lines upgrade. It can only be placed on a Jungle Terrain and nowhere else. It costs City cash24000 to build, takes 36 hours to build and gives 500 XP when construction is complete. It consumes Lightning thing-040 and a 1x1 tile space. It requires Level 20 to unlock.