[neverdem]

If the person has prior military service, the age is extended to 64.

Where did you find that exception?

[M1Tanker]

http://www4.law.cornell.edu/uscode/html/uscode32/usc_sec_32_00000313——000-.html

This has more to do with “Organized Militia” service than “unorganized”. The code was changed within the last few years as this used to be exclusively stated,