The Bureau of Engraving and Printing operates on basic authorities conferred by act of July 11, 1862 (31 U. S. C. 303), and additional authorities contained in past appropriations made to the Bureau that are still in force. Operations are financed by a revolving fund established in 1950 in accordance with Public Law 81-656. The Bureau is headed by a Director who is selected by the Secretary of the Treasury. The Bureau designs, prints, and finishes all of the Nation's paper currency and many other security documents, including White House invitations and military identification cards. It also is responsible for advising and assisting Federal agencies in the design and production of other Government documents that, because of their innate value or for other reasons, require security or counterfeit-deterrence characteristics.