Welcome to the Forum Mike:
You got excellent feedback above from experienced and knowledgeable riders. Not much to add, except my opinion.
I would recommend that you test ride the new UCE C5 or G5 whatever the dealer lets you ride. You will be able to tell the
difference and similarities between 2002 used military and the 2010 UCE bike. If the dealer does not have a test bike, check out another dealer just to get an experience with newer bike.
The only compelling reason to buy 2002 military would be if you can modify the engine to a high powered ACE Fireball piston, head mods offered by ACE.CAFE.
But check with him first if it can be done on that 2002 bike. That modification will tremendously boost the power and performance of 2002 bike. With that modification, it could out run the new UCE bike ! Irrespective of any modification, older bikes do require lot more maintenance.
This modification is not for newer UCE bikes. If you do not want ACE Fireball Engine modfication on 2002 bike, in that case I would say go with newer 2010 UCE.
Another option is - buy both - one to ride and the other to tinker with
.