In 1985, the United States Department of Energy (DOE) became responsible for the Museum, and the staff became DOE employees. In 1991 the Museum received its charter as a national museum and its mission expanded to include aspects of nuclear science and history beyond the manufacturing of nuclear weapons. The Museum also became affiliated with the Smithsonian Institution. In 1992 the National Atomic Museum Foundation (NAMF) was created to act as a supporting organization for the Museum and reduce the financial burden on taxpayers.