; (3) if the officer is determined to have engaged in misconduct or displayed substandard performance in the position concerned; or (4) when otherwise determined by the Commandant to be in the best interests of the Coast Guard. (g) Limitation on number of eligible positions An appointment under this section may only be made for service in a position designated by the Secretary for the purposes of this section. The number of positions so designated may not exceed the following: (1) As lieutenant, the number equal to 0.2 percent of the authorized number of lieutenants in the Coast Guard as of the end of the fiscal year in which the appointment is made. (2) As lieutenant commander, the number equal to 0.6 percent of the authorized number of lieutenant commanders in the Coast Guard as of the end of the fiscal year in which the appointment is made. (3) As commander, the number equal to 0.3 percent of the authorized number of commanders in the Coast Guard as of the end of the fiscal year in which the appointment is made. (4) As captain, the number equal to 0.15 percent of the authorized number of captains in the Coast Guard as of the end of the fiscal year in which the appointment is made. . (b) Analysis for chapter 21 The analysis for chapter 21 of title 14, United States Code, is amended by inserting after the item relating to section 2129 the following: 2130. Promotion to certain grades for officers with critical skills; captain, commander, lieutenant commander, lieutenant. . 203. Grade on retirement (a) Retirement of Commandant or Vice Commandant Section 303 of title 14, United States Code, is amended by adding at the end the following: (d) Retirement under this section is subject to section 2501(a) of this title. . (b) Retirement Section 306 of title 14, United States Code, is amended— (1) in subsection (a), by inserting satisfactorily, as determined under section 2501 of this title before the period