The title wouldn't be so funny except this double agent originated from the Defense Contract Management Agency (DCMA).
Here's the user agent string that caused the problem:
144.183.226.xxx [xxx.dcma.mil.] requested 2 pages as "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Mozilla/4.0 (compatible; MSIE 3.3; Windows NT; DCMA 5.5 r.2.0); .NET CLR 1.0.3705; .NET CLR 1.1.4322; InfoPath.1)"Anyone notice the double agent in the string?
It was the second "Windows NT;" without the version number, which is technically invalid, that caused them to get snared.
Oopsy, military intelligence stikes again.
Just hope whoever did that doesn't contribute code to the missile defense systems!