If my husband is retired from public service AND retired military which should I put down as his Occupation or Job Title? Both come up as I type

Anything you want.  The question is just for statistics.  I just put "taxpayer" or retired taxpayer.

You can enter just "Retired".

The IRS requires TurboTax to ask about your occupation, so you’ll need to put something here. Most of the time, an occupation is what you do for work, but if you’re retired, a student, or a stay-at-home parent, that can be your occupation as well.