The purposes of GCA are to exchange information and expand knowledge of the U.S. Rifle, Caliber .30, M1.
The purposes of GCA are to exchange information and expand knowledge of the U.S. Rifle, Caliber .30, M1; to preserve and publicize the history of the rifle and its inventor John C. Garand; to assist and encourage new collectors; to assist authors in writing new reference works; to assist members in their collecting; and to encourage competitive and recreational safe shooting of the rifle.