"It's none of their business."
Au contraire!
If a person claims to be a former combat Marine and is running for public office then your combat military record should be a matter of record. And if you don't want it to be then you have no business riding on that record.
It's clear to me that Murtha "requesting" a PH is BS and his refusal to release his records is disconcerting to say the least that he is hiding something.