The USS John C. Calhoun (SSBN 630) Veterans Association is a fraternal organization for United States Navy Submariners who served aboard the nuclear powered fleet ballistic missile submarine USS John C. Calhoun (SSBN-630). The primary purpose of the Association is to provide an opportunity for members to enjoy camaraderie with former shipmates and other submariners with a common background of service aboard the Calhoun, and to provide the opportunity for members to actively participate in reunions and other activities of the Association.