S.A.L. members include males of all ages whose parents or grandparents served in the U.S. military and were eligible for American Legion membership. Members of The American Legion, American Legion Auxiliary and Sons of The American Legion comprise the Legion Family, which has a combined membership of nearly 4.2 million.

Although Sons has its own membership, the organization is not a separate entity. Rather, S.A.L. is a program of The American Legion. Many Legionnaires hold dual membership in S.A.L.

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 I, World War II, the Korean War, the Vietnam War, Lebanon, Grenada, Panama, the Persian Gulf War and the War on Terrorism, 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 forms or class of membership except an active membership.