The Claymores are the Radiant Garden's defensive system, installed presumably by Cid, who also presumably gave them their name. The Claymores assisted Sora, Donald Duck, and Goofy in defeating any Heartless or Nobodies within the village's borders. At one point, however, the MCP of the Hollow Bastion OS took control of the Claymores, making them attack Sora instead.
Not to be confused with the weapon of choice of Saix