Ask your sponsor to take your resume to HR and ask them those questions in person. Mark K. for example is former military himself so I'm sure he'll understand the confusion.. THEN fill out the app.

As far as editing the app, do a search and you'll find many different responses. Our HR uses Commodore 64 computers and they just upgraded to Windows 3.0. (I'm kidding ..but not really)

So when you apply have all the documents nearby and be ready to do it all in one session.
If you "save" it to be completed later you might - or you might not - be able to access it again. A friend saved his app and promptly got a "Thank you for your interest but you don't meet our critieria/minimums" message or whatever term they used.

Well, duh, of course he didn't, he'd left out the flight time spreadsheet and was going to fill it out the next day. He wasn't able to log back in and make any changes even when HR tried to reset his application. (a couple of references had contacted the HR). He ended up creating a new app with a new email address.

Good luck to you!