FYI, with 39 credits I believe your nephew gets promoted to E-2. For 9 more college credits, 48 credits total, He starts off at E-3.

United States Navy Advanced Enlistment Ranks (Rates)

Might I suggest a couple of more CLEP or DANTES exams. It will save him 9 months to get promoted down the road.

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CLEP exams passed:
Management, Accounting, Marketing, Macroeconomics, Microeconomics

DSST exams passed:
Human Resources Management, Organizational Behavior, Statistics, Management Information Systems

Earned:
B.A. in Business Administration: Technology Management (magna cum laude) from Saint Leo University

In Progress:
M.S. in Leadership and Business Ethics from Duquesne University (24 credits completed)