Mr Gepfert, Sir!
Above the links posted above, for the 25th Inf Div and the 25th Avn Bn, may I also suggest taking a look at the following aswell?
Results via google, by direct result-link of google (725th Maint. Bn within the "Viet Nam Veterans Homepage"-locate a buddy/ARMY-section):
Google: +site
Google resultlink for directed search for "725th" within messageboard-provider "voy.com" (results from more than 1 messageboard, based within voy.com's server):
http://www.google.com/search?q=725th...n&lr=&filter=0
I noted that in 1 of the "voy.com"-boards, you had already posted yourself, and did receive a reply by a mr Jeff Northridge. But there is 1 other board at voy.com, which also has posts for/about the 725th Maint Bn, which you will see in the above google result-link. It is the board that has "/4844/" in its URL.
I hope you will recognize names in the "signings" of any of the results within the above google-resultlinks. Or perhaps by contacting any of them, they may be able to help you further?
T G C! (=Take Good Care!)
Sincerely
A.B