There are 3 ways you  can become a member

1- Regular Member  http://www.legion.org/
If you have served federal active duty in the United States Armed Forces during any of the war eras listed below, and have been honorably discharged or are still serving.

*AUGUST 2, 1990 TO TODAY (PERSIAN GULF/ WAR ON TERRORISM)
DECEMBER 20, 1989 TO JANUARY 31, 1990 (OPERATION JUST CAUSE – PANAMA)
AUGUST 24, 1982 TO JULY 31, 1984 (LEBANON/GRENADA)
FEBRUARY 28, 1961 TO MAY 7, 1975 (VIETNAM)
JUNE 25, 1950 TO JANUARY 31, 1955 (KOREA)
DECEMBER 7, 1941 TO DECEMBER 31, 1946 (WORLD WAR II)
APRIL 6, 1917 TO NOVEMBER 11, 1918 (WORLD WAR I)

2- S.A.L.  http://www.legion.org/sons
Members include males of all ages whose parents or grandparents served in the U.S. military and were eligible for American Legion membership.

3-AUX   https://www.alaforveterans.org/
Membership in the American Legion Auxiliary shall be limited to the grandmothers, mothers, sisters, wives, and direct and adopted female descendants of members of The American Legion, and to the grandmothers, mothers, sisters, wives, and direct and adopted female descendants of all men and women who were in the Armed Forces of the United States during any of the following periods and died in the line of duty during such service, or who, having received an Honorable Discharge, died after service: