and Public Service established under section 201. (3) Implementation The Under Secretary shall implement the list of critical skills under this section not later than January 1, 2022. 406. Individual Ready Reserve for Critical Skills (a) Individual Ready Reserve (1) In general Chapter 1005 of title 10, United States Code, is amended by inserting after section 10144 the following new section: 10144a. Ready Reserve: Individual Ready Reserve for Critical Skills (a) In general For the purpose of recruiting personnel with the requisite critical skills, the Secretary of each military department, under the direction of the President, may establish and maintain an Individual Ready Reserve for Critical Skills within the Ready Reserve of each of the reserve components under the jurisdiction of such Secretary. (b) Membership requirements The Secretary of Defense shall outline the requirements for membership in the Individual Ready Reserve for Critical Skills, including providing guidance on— (1) a means for each armed force to establish qualifying critical skills for inclusion in its Individual Ready Reserve for Critical Skills