Upon a determination by the Secretary concerned that a member of the armed forces not covered by section 1201, 1202, or 1203 of this title would be qualified for retirement under but for the fact that his disability is not determined to be of a permanent nature and stable, the Secretary shall, if he also determines that accepted medical principles indicate that the disability may be of a permanent nature, place the member’s name on the temporary disability retired list, with retired pay computed under .section 1204 of this titlesection 1401 of this title