“No interest at all in all those UNIX servers either I guess. The U.S. Army Switched to Apache running on OSX and haven’t been hacked since”
You don’t know that for sure.
They're currently running 4D WebSTAR on OS X, with some more back-end supporting XServes.
They switched in 99 after a kid hacked their NT system, defacing the site, and they researched what could provide the best security. The Army has a highly-attacked, trafficked and high-profile site. Another compromise would be quite embarrassing. Thus they go with OS X.