MarkB, 1.5 miles in 9 minutes is a very lofty goal for prior to boot camp. I can't be sure, but my guess is that they start you out at about 18 mins for 1.5 miles (which is so easy, you could speed walk your way there)... and if you can't do that, they will place you in a physical conditioning platoon for a period of time until you can pass the entrance PT test, or 8 weeks (after which you would be discharged if you could not pass the PT test). At least that's the way it was in the USMC.
To get a little bit scientific, most people walk at about 2.5 mph, which would be a 36 minute 1.5 mi. If you speedwalk or jog, you can make 5-6 mph, or 18 minute 1.5 mi. To get to a 9 minute 1.5 mi, you have to run hard at 10 mph for 9 minutes. That's pretty difficult if you don't have the benefit of a few month's of boot camp to help you out.
I'm not trying to discourage you with this... but maybe your first goal should be an 18 minute 1.5 mi... then start shaving a minute off your time each week until you reach your goal. In the meantime, start walking, or jogging very very frequently, and for at least 2 miles. The more cardio you do, the easier it is.