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As Representative Commissioner of Art and Monuments for General Headquarters during the Allied Occupation of Japan, Tierney was responsible for organizing and overseeing the repair and preservation of cultural sites, art, and monuments bombed and destroyed in Japan during the Pacific War. General Douglas MacArthur's staff during the occupation of Japan included a Monuments, Fine Arts, and Archives (MFAA) section. Among those serving with Tierney in Tokyo were Sherman Lee and Laurence Sickman.