War Portrait Room of National Gallery, by Unknown, 1924, Smithsonian Archives - History Div, War Portrait Room, 1924, located on the second floor of the National Gallery of Art (NGA), now the Smithsonian American Art Museum (SAAM), in the new United States National Museum (USNM) building, now the Natural History Building (NHB). The National Art Commission had been developed to commission American artists to create a pictorial record of World War I through portraits of leaders from America and Allied Nations. The 20 portraits that resulted formed the core of what became the National Portrait Gallery (NPG)..