; or (ii) separately, with respect to each armed force and the United States Special Operations Command. (C) If thresholds under this paragraph are applicable Department-wide, such thresholds shall be established and maintained by the Under Secretary of Defense for Personnel and Readiness. If such thresholds are applicable only to a separate armed force or the Under States Special Operations Command, such thresholds shall be established and maintained by the Secretary of the Army, the Secretary of the Navy (other than with respect to the Marine Corps), the Secretary of the Air Force, the Commandant of the Marine Corps (with respect to the Marine Corps), and the Commander of the United States Special Operations Command, as applicable. (D) In undertaking recordkeeping for purposes of subsection (c), the Under Secretary shall, in conjunction with the other officials and officers referred to in subparagraph (C), collect complete and reliable personnel tempo data of members described in subparagraph (A) in order to ensure that the Department, the armed forces, and the United States Special Operations Command fully and completely monitor personnel tempo under a waiver under paragraph (1) and its impact on the armed forces. . (b) Deadline for implementation Paragraph (2) of section 991(d) of title 10, United States Code, as added by subsection (a), shall be fully implemented by not later than March 1, 2020.