Any male person above the age of eighteen years shall be eligible to membership in this club who is descended lineally or collaterally from an officer of the Army, Navy or Marine Corps, Regular or Volunteer, who served in some part of Mexico, Mexican territory or Mexican waters, during the War with Mexico (May 13,1846 to February 2, 1848). The Club allows collateral relationship to fourth cousin.
The Aztec Club of 1847 has only one class of membership, that being life membership. There are no annual dues. Membership is by invitation only.
Brothers, Sons, Grandsons and Nephews of a current member may join by proving the relationship.