Clear Free Ranger 6 training course to unlock the Tao/dog suit.

Well, the hint is one detail short for it to work. There are only five Free Ranger Missions. There is something you have to have first. In the kitchen, Tao's dog house has "Dog Tags" (like military and Navy tags) that belong to a missing Free Ranger. Before the final mission talk to Sarge until he mentions the Tags. Then you have the Tao suit. (Unverified)

Submitted by Canca boodeewoowoo
Addition by OnyxAlien Snakefreak