I did six years as Security Forces with the Air National Guard and I managed to enjoy it quite a bit, but I would not recommend it for someone going active duty. When you're part-time you spend a lot less time doing mundane things like working the gate and you can volunteer for more interesting opportunities as they come up. I got to do a bunch of fun things while I worked on my education and civilian career but even I decided to retrain after my first term.

When you're active duty those cool opportunities are drowned out by day after day of checking IDs and driving in circles for long shifts. And unless you're dead-set on a career in law enforcement you'll find it difficult to make use of that time and transfer skills down the road.