; or (2) the information required under paragraph (5) of such subsection. D Air Force programs 141. Prohibition on availability of funds for retirement of E–8 JSTARS aircraft (a) Prohibition on availability of funds for retirement Except as provided by subsection (d), none of the funds authorized to be appropriated by this Act or otherwise made available for fiscal year 2019 for the Air Force may be obligated or expended to retire, or prepare to retire, any E–8 Joint Surveillance Target Attack Radar System aircraft. (b) Additional limitation on retirement (1) In general In addition to the prohibition in subsection (a), the Secretary of the Air Force may not retire, or prepare to retire, any E–8C aircraft until the Under Secretary of Defense for Acquisition and Sustainment submits to the congressional defense committees the certification described under paragraph (2). (2) Required certification The certification referred to in paragraph (1) is a certification submitted by the Under Secretary of Defense for Acquisition and Sustainment to the congressional defense committees that the Department of Defense’s plan for 21st Century Battle Management Command and Control, as briefed to the congressional defense committees in March 2018, is progressing according to the schedule presented in March 2018. (c) Exception The prohibitions in subsections (a) and (b) shall not apply to individual E–8 Joint Surveillance Target Attack Radar System aircraft that the Secretary of the Air Force determines, on a case-by-case basis, to be nonoperational because of mishaps, other damage, or being uneconomical to repair. 142. B–52H aircraft system modernization report Not later than 180 days after the date of the enactment of this Act, the Secretary of the Air Force shall submit to the congressional defense committees a report on the long term modernization of the B–52H aircraft, including an estimated timeline and requirements as an integrated aircraft system of— (1) electronic warfare and defensive systems