1515 is the chassis number suffix (its unique to the vehicle) and 171446 is the Army's registration number.
I have more time on my hands so I can subscribe to forums and enjoy them, whereas before it was full on each day, 20 staff to manage, etc etc.... retirement's just soooo hard to take!
I mean, take today for example: we are off on a float trip along the Yellowstone River with friends .... tough, eh?
Mike C