((a)) Each officer who is retained on active duty under section 2143(a)(4), 2143(b), or 2145 of this title may, if he so requests, with the approval of the Secretary, be honorably discharged at any time prior to the date otherwise specified for his retirement or discharge.
((b)) An officer of the Regular Coast Guard who is discharged under this section or section 2142, 2143, or 2144 of this title and has completed 6 or more, but less than 20, continuous years of active service immediately before that discharge or release is entitled to separation pay computed under subsection (d)(1) of .
((c)) An officer of the Regular Coast Guard who is discharged under and has completed 6 or more, but less than 20, continuous years of active service immediately before that discharge or release is entitled to separation pay computed under subsection (d)(1) or (d)(2) of as determined under regulations promulgated by the Secretary.
((d)) Notwithstanding subsections (a) and (b), an officer discharged under this chapter for twice failing of selection for promotion to the next higher grade is not entitled to separation pay under this section if the officer requested in writing or otherwise sought not to be selected for promotion, or requested removal from the list of selectees.