re: Any vets or currently serving have any advice on the PFT?

I've been out of the Army 10 years now so I can't really give advice on the pull ups as we didn't do those back then but there are a lot of easy ways to improve in running. As someone mentioned, interval training is the easiest and most effective way to improve. Another way to improve is run in areas with a lot of hills, or a treadmill with a steep incline if you live in a flat area. I ran track all through high school in the 200, 400, & 800 so running was my strong point going in. When I arrived to my unit in Hawaii I wanted to be the fastest so I did interval training up and down Kole Kole Pass, around 9 miles. Went from around a 13 minute two mile to 10:45 within a couple of months.

Don't know what to tell you about sit ups, but do more of them. To me that was the easiest part of the test. All that said, good luck.