6,492. (3) For the Air National Guard of the United States, 13,569. (4) For the Air Force Reserve, 8,938. (b) Variance Notwithstanding section 115 of title 10, United States Code, the end strength prescribed by subsection (a) for a reserve component specified in that subsection may be increased— (1) by 3 percent, upon determination by the Secretary of Defense that such action is in the national interest