It is highly possible, however, that all Ga-Matoran are compulsory part-time members of the Defense Force. Given the small size of Ga-Koro, its great need for protection (due to its integral role in trade and travel), and the fact that Shasa, one of the Force's known members, was opposed to violence, it can be assumed that all Ga-Matoran on Mata Nui were members of the Defense Force. Also considering that Marka, Pelagia, and Kai controlled all of Ga-Koro's boats, and none of them are confirmed Defense Force members, it can be assumed that they are, in fact, guards who rent out the navy's available ships to travelers rather than renting out their privately-owned ships to travelers and the navy.
The Ga-Koro Defense Force patrolled Ga-Wahi with green motorized Boats. They carried Bamboo Poles as weapons and some also had black and blue Bamboo Disks. Kolhii Sticks were also occasionally used, although were less common. The Defense Force used Kolhii Sticks to destroy the Ga-Koro Bridge at the start of the Battle of Ga-Koro, and used them throughout the battle against the Pahrak. They also surrounded Ga-Koro with Bamboo Poles to keep Rahi out. Additionally, Ga-Koro has a moveable Underwater Hut which the Defense Force uses in times of attack to temporarily evacuate the Matoran from a battle in the village. They were also in charge of the gate, which could be closed in times of attack (the gate was closed during the Tarakava attack, and after the Bohrok War and the reconstruction of Ga-KoroTuragaNokama had Kotu close the gate and put the village on lockdown as a precaution while Nokama was gone). During the Bohrok War, the Force used several Keras crabs that the Ussalry managed to tame- after the war they were released and fed Ruki Fish as a repayment, though it is likely that the Defense Force would have used them again had another major war occurred or if the Rahkshi had attacked Ga-Koro. Several other weapons were likely used in battles, such as Nokama's Trident, Hatchets, and Sickles, but such usage has never been recorded.