By the authority vested in me as President by the Constitution and the laws of the United States of America, including the Federal Vacancies Reform Act of 1998, as amended, 5 U.S.C. 3345 et seq., it is hereby ordered as follows:Section 1. Order of Succession. (a) Subject to the provisions of section 2 of this order, the following officials of the Department of Defense, in the order listed, shall act as and perform the functions and duties of the office of the Secretary of Defense (Secretary) during any period in which the Secretary has died, resigned, or otherwise become unable...