((a)) For the purpose of computing their basic pay, commissioned officers of the uniformed services (other than commissioned warrant officers) are assigned by the grade or rank in which serving to the following pay grades:

((b)) For the purpose of computing their basic pay, warrant officers of the armed forces are assigned, by the warrant officer grade in which serving, to the following pay grades:

((c)) Unless entitled to the basic pay of a higher pay grade, an aviation cadet of the Navy, Air Force, Marine Corps, or Coast Guard is entitled to monthly basic pay at the lowest rate prescribed for pay grade E–4.

((d)) Unless he is entitled to the basic pay of a higher pay grade, an aviation pilot of the Navy Reserve, Marine Corps Reserve, or Coast Guard Reserve is entitled to monthly basic pay at the rate prescribed for pay grade E–5.

((e)) Except as provided by subsections (c) and (d), enlisted members of the uniformed services shall, for the purpose of computing their basic pay, be distributed by the Secretary concerned in the various enlisted pay grades set forth in . However, except as provided by , an enlisted member may not be placed in pay grade E–8 or E–9 until he has completed at least 8 years or 10 years, respectively, of enlisted service computed under .