The Emil A. Blackmore Museum of The American Legion is located on the fourth floor of National Headquarters in Indianapolis, between the library and the National Executive Committee Room. The museum occupies two rooms: one a display of military and Legion-related items and the other a fine-arts collection. The museum is named for Emil A. Blackmore, who served as the Legion's national adjutant from July 1, 1956, until his death on April 21, 1967.

The museum has a number of noteworthy items, including 2,500 World War I and World War II posters and the original handwritten draft for the 1944 GI Bill of Rights.

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