; (2) in subparagraph (E), by adding and at the end; and (3) by adding at the end the following new subparagraph: (F) in the case of the Joint Artificial Intelligence Center, appoint scientists and engineers to a total of not more than 5 scientific and engineering positions in the Center; . (c) Extension of terms of appointment Subsection (c)(2) of such section is amended by striking “or the Defense Innovation Unit Experimental” and inserting “the Defense Innovation Unit Experimental, or the Joint Artificial Intelligence Center”. III Operation and Maintenance A Authorization of Appropriations 301. Authorization of appropriations Funds are hereby authorized to be appropriated for fiscal year 2020 for the use of the Armed Forces and other activities and agencies of the Department of Defense for expenses, not otherwise provided for, for operation and maintenance, as specified in the funding table in section 4301. C Logistics and Sustainment 332. Modification to limitation on length of overseas forward deployment of naval vessels Section 323 of the John S. McCain National Defense Authorization Act for Fiscal Year 2019 ( Public Law 115–232 ) is amended— (1) by redesignating subsection (c) as subsection (d)