(b) Covered Officials.— Subsection (a) applies to the following officials of the Department of Defense:
(1) The Under Secretary of Defense for Acquisition, Technology, and Logistics.
(2) The Secretary of each military department.
(3) The Director of the Defense Advanced Research Projects Agency.
(4) The directors and heads of other offices and agencies of the Department of Defense with assigned research, development, test, and evaluation responsibilities.