made by this subsection shall take effect on the date on which the certification is submitted under subsection (a). 1846. End strength flexibility (a) Additional authority To vary end strengths (1) Authority Notwithstanding section 115(g) of title 10, United States Code, upon determination by the Secretary of the Air Force that such action would enhance manning and readiness in essential units or in critical specialties, the Secretary may vary the end strength authorized by Congress for a fiscal year as follows: (A) Increase the end strength authorized pursuant to section 115(a)(1)(A) of such title for a fiscal year for the Space Force by a number equal to not more than 5 percent of such authorized end strength. (B) Decrease the end strength authorized pursuant to section 115(a)(1)(A) of such title for a fiscal year for the Space Force by a number equal to not more than 10 percent of such authorized end strength. (2) Termination The authority provided under paragraph (1) shall terminate on the last day of the transition period. (b) Temporary exemption for the Space Force from end strength grade restrictions Sections 517 and 523 of title 10, United States Code, shall not apply to the Space Force during the transition period. 1847. Promotion authority flexibility (a) Promotion authority flexibility During the transition period, the Secretary of the Air Force may convene selection boards to consider officers on the Space Force officer list for promotion, and may promote Space Force officers selected by such boards, in accordance with any of the following provisions of title 10, United States Code: (1) Chapter 36. (2) Part III of subtitle E. (3) Chapter 2005, as added by section 1716. (b) Coordination of provisions (1) For a selection board convened pursuant to subsection (a) to consider members of the Space Force for promotion in accordance with chapter 36 of such title— (A) provisions that apply to an officer of a regular component of the Armed Forces shall apply to an officer of the Space Force