During World War II Brown worked for the United States Army and after the war, he was commissioned as a lieutenant colonel in the Army and he traveled to Europe to supervise the return of art treasures stolen by the Nazis to their rightful owners.
During World War II Brown was commissioned as a lieutenant colonel and worked for the United States Army in Europe as Special Cultural Advisor for Monuments, Fine Arts, and Archives (MFAA). After the war, he helped supervise the return of art treasures stolen by the Nazis to their rightful owners.