Welcome welcome.
Is it me, or are they all one voice actor, just with slight pitch and tempo changes? Anyway, if you're using SH3 commander, you could always dismiss him, hire a new petty officer, and then give him the radio qualification.
Technically, you could do that without SH3 commander of course, but it would use up a post patrol qualification assignment. I don't know of any way to edit the files to change the voices - though that doesn't mean one doesn't exist.
Good luck
