helicopters and other types of aircraft having possible civilian application), if the President determines that there are compelling foreign policy or national security reasons for those defense articles being provided by commercial lease rather than by government-to-government sale under such Act. (5) special defense acquisition fund Not to exceed $900,000,000 may be obligated pursuant to section 51(c)(2) of the Arms Export Control Act for the purposes of the Special Defense Acquisition Fund (the Fund), to remain available for obligation until September 30, 2021: Provided , That the provision of defense articles and defense services to foreign countries or international organizations from the Fund shall be subject to the concurrence of the Secretary of State. (6) extension of war reserves stockpile authority (A) Section 12001(d) of the Department of Defense Appropriations Act, 2005 ( Public Law 108–287