; 120 Stat. 2105), as most recently amended by section 122 of the National Defense Authorization Act for Fiscal Year 2016 ( Public Law 114–92 ; 129 Stat. 749), is further amended by striking paragraph (2) and inserting the following new paragraphs: (2) CVN– 79 The total amount obligated from funds appropriated or otherwise made available for Shipbuilding and Conversion, Navy, or for any other procurement account, for the aircraft carrier designated CVN–79 may not exceed $11,398,000,000 (as adjusted pursuant to subsection (b)). (3) Follow-on ships The total amount obligated from funds appropriated or otherwise made available for Shipbuilding and Conversion, Navy, or for any other procurement account, for any ship that is constructed in the CVN–78 class of aircraft carriers after CVN–79 may not exceed $12,000,000,000 (as adjusted pursuant to subsection (b)). . 126. Extension of limitation on use of sole-source shipbuilding contracts for certain vessels Section 124 of the National Defense Authorization Act for Fiscal Year 2017 ( Public Law 114–328 ) is amended by striking 2017 and inserting 2017 or fiscal year 2018 . D Air Force Programs 131. Inventory requirement for Air Force fighter aircraft (a) Inventory requirement Section 8062 of title 10, United States Code, is amended by adding at the end the following new subsection: (i) Inventory requirement (1) Effective October 1, 2017, the Secretary of the Air Force shall maintain a total aircraft inventory of fighter aircraft of not less than 1,970 aircraft, and a total primary mission aircraft inventory (combat-coded) of not less than 1,145 fighter aircraft. (2) In this subsection: (A) The term fighter aircraft means an aircraft that— (i) is designated by a mission design series prefix of F– or A–; (ii) is manned by one or two crewmembers