Thanks for posting these images. Its truly amazing that vandals haven't ruined everything with their own "art work" as seen at other sites. As far as preservation goes, it depends upon who has the rights to the building. One expedient is to seal the building after a detailed inventory of the structure and artwork is taken. After that its a matter of gathering interested parties with funds to properly manage it, like a non-profit organization, grants, etc. Doing a quick internet search, there seems to be some grassroots interest in preserving Fort Wolters, such as this http://www.fortwolters.com
It is pretty amazing that these painted works of art have survived time, the elements (most/all the windows are gone) and vandals.
I too wonder who owns these buildings...
As for your link, I am well aware of that site. The former webmaster (a Vietnam army helicopter pilot) was a friend of mine who passed away from cancer a few years ago. The current webmaster is a friend, also a former army helicopter pilot. I've even written a few pieces for the site about some Nike vets who were stationed there:
I also attend meetings in Mineral Wells from time to time of the Fort Wolters Historical Committee. These guys and gals were the ones responsible for getting the replacement arch installed over the main gate about 10 years ago. Their new website is almost ready. When it's up, I'll post the link here.
Perhaps this artwork can be part of their next preservation effort.