A couple of questions came to mind rather quickly.

1. What is the likely hood that a job of a similar caliber will present itself in the next 3-4 years?
2. What is preventing you from taking the job, seeing if you like it better than the AF, and then coming back off of retirement if the civilian world isn't as good as the AF?
3. Why not take the civilian job and then get a Guard job?
4. Have you ever been happy with a staff job far away from the flight line, or even in the school house learning "officer stuff" rather than "flying stuff?"

Spend an hour looking at the various job requirements. A lot want "recency of flight experience." The numbers vary but what I've seen is 100 hours in the last 6-12 months. I'd hate to have to buy 100 hours in a C-172 for a job flying swept wing jets. Your four years on staff could turn into 5-10 more years in the service because you take a flying job to get back into the cockpit, then O-6 starts knocking on the door.

I'm biased because I'm picking up my ETS orders from the transition office tomorrow. I am, however, keeping the option of signing back up in my back pocket.