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He was a member of Kappa Alpha Order, Phi Kappa Phi, the Order of the Coif and the editorial board of Louisiana Law Review. Immediately after law school, Brown entered the United States Army as an officer through LSU Reserve Officers Training Corps.
The National Defense Act of 1916 provided for an expanded army during peace and wartime, fourfold expansion of the National Guard, the creation of an Officers' and an Enlisted Reserve Corps, plus the creation of a Reserve Officers' Training Corps in colleges and universities.