This reminds me when I was toying with some grey hat SEO tactics 10 years ago or so, one of which consisted in finding .GOV and .MIL sites with a redirection page to an external site.

The trick was to find pages like somesite.gov/redirect.asp?target=http://yoursite.com&text=Awesome+Site that would then display a link with custom anchor to your site, and supposedly getting benefit from the .GOV or .MIL Google juice.

It was quite trivial to set up dozens of those links (didn't really bothered to get real measure of the google juice benefit, though)