30 July 2019: Membership eligibility changed. Applicants to the American Legion must have served at any time and location during one or more war periods: 6 Apr 1917 to 11 Nov 1918, and 7 Dec 1941 to the present. An applicant must have honorably served at least one day, anywhere in the world. All active duty and reserve personnel are eligible to join. For details, go to the Membership tab.