I did 3 tours in Nam, with 5th SF. I'd re-enlist in an heartbeat, but at 55, the local Army Recruiter says I'm past the age requirements. He took my app and copy of DD214, anyway.
Sounds like you've done more than your share already. Time to sit down and let someone else have a turn for a change!
For awhile (9 years) I served in uniform with the state defense force in my state, mostly with retirees and other prior service guys. It was a great experience -- I think it had by far the most motivated soldiers I've ever seen, since each one really wanted to be there. If any freepers want to see if their state has such an organization, click here: http://www.sgaus.org/States.htm or here: http://www.sgaus.org/.
I think the Coast Guard Auxiliary can also use good folks, and there are probably a few other ways for prior service folks to get back into uniform for the war on terrorism.