(1)
In general
For the purposes of basic pay, a person appointed under this section in the grade of lieutenant shall be credited as having, on the date of that appointment, three years of service, and a person appointed under this section in the grade of lieutenant (junior grade) shall be credited as having, as of the date of that appointment, 11/2 years of service.
(2)
Higher credit under other law
If a person appointed under this section is entitled to credit for the purpose of basic pay under any other provision of law that would exceed the amount of credit authorized by paragraph (1), that person shall be credited with that amount of service in lieu of the credit authorized by paragraph (1).