I was tricked!

I was expecting to see only two Kaydets at the PSAM earlier this month, but there was actually three.
I first photographed these two...
http://community.webshots.com/photo/268 ... 4338VUKdjW
http://community.webshots.com/photo/268 ... 5618uyXEcy
I then forgot that I had actually photographed two, and when I saw the third I thought it was the 2nd one, and didn't pay much attention since I figured I already had it noted. Here is a picture of it...
http://community.webshots.com/photo/268 ... 0315Zozoax
The problem is that I have nothing that indicates the true s/n, c/n or c/r of this airframe. It does have the markings "289" on the nose, but nothing else is in the picture to go on.
Does anyone know the ID of this airframe?
Mike