; and (B) credit amounts transferred to an applicable existing or new appropriation account or fund, to be merged with and to be available for the same time period as the appropriation or fund, to which transferred. (2) Relationship to other laws The authority under this subsection is in addition to any other transfer authority provided by law. (g) Mission assurance during transition period Notwithstanding any other provision of law, the Secretary of Defense may, during the transition period, authorize space forces, organizations, functions, personnel, installations, or facilities transferred to the Department of the Air Force to be funded, operated, or controlled by another Department of Defense component, including a military department, without compensation or reimbursement, if the Secretary determines that action is essential to maintain space mission integrity and readiness. (h) Exclusion of space organizations from fiscal year 2020 and 2021 headquarters costs ceilings (1) Exclusion The amounts expended on space organizations shall be excluded from the calculation of the amounts that may be obligated and expended on major headquarters activities pursuant to section 931 of the John S. McCain National Defense Authorization Act for Fiscal Year 2019 ( Public Law 115–232 ) and major Department of Defense headquarters activities pursuant to section 346(b) of the National Defense Authorization Act for Fiscal Year 2016 ( 10 U.S.C. 111 note). (2) Definitions In this subsection, the term space organizations means the following: (A) The office of the Under Secretary of the Air Force for Space. (B) The Space Staff. (i) Suspension of manpower limitations during transition period Notwithstanding any other provision of law, during the transition period, members of the Armed Forces appointed, assigned, or transferred to the Space Force and civilian employees appointed, assigned, or transferred to or within the Department of the Air Force to support the Space Force shall not count against any limitation on manpower that may