All male descendants adopted sons and stepsons of members of The American Legion, and such male descendants of veterans who died in service during World War I or since December 7, 1941, during the delimiting periods set forth in Article IV, Section 1, of the National Constitution of The American Legion or who died subsequent to their honorable discharge from such service, shall be eligible for membership in the Sons of The American Legion. There shall be no form or class of membership except an active membership.