vacancy announcement recruiting from the State or territory in which the position is based. (B) Covered position defined In this paragraph, the term covered position means a safety-critical position, to include personnel located at contract towers, based in Alaska, Hawaii, Puerto Rico, American Samoa, Guam, the Northern Mariana Islands, and the Virgin Islands. . (c) GAO study on Alaska aviation safety (1) Study The Comptroller General shall conduct a study to— (A) examine the effectiveness of the Don Young Alaska Aviation Safety Initiative to improve aviation safety, service, and infrastructure