; (2) a competitive acquisition process, to include comparative flight demonstrations in realistic airborne environments; and (3) low risk and affordable solutions with minimal impact or changes to existing host platforms, and minimal overall integration costs. (c) Briefing Not later than February 15, 2018, the Under Secretary and the Vice Chairman shall provide to the congressional defense committees written documentation and briefing on the plan developed under subsection (a). (d) Limitation Of the funds authorized to be appropriated by this Act or otherwise made available for fiscal year 2018 for operations and maintenance for the Office of the Secretary of Defense and the Office of the Chairman of the Joint Chiefs of Staff, not more than 85 percent may be obligated or expended until a period of 15 days has elapsed following the date on which the Under Secretary and Vice Chairman submits to the congressional defense committees the plan required by subsection (a). 232. Clarification of selection dates for pilot program for the enhancement of the research, development, test, and evaluation centers of the Department of Defense Section 233 of the National Defense Authorization Act for Fiscal Year 2017 ( Public Law 114–328 ) is amended— (1) in subsection (b)(2), by striking the enactment of this Act both places it appears and inserting such submittal