Apparently, a U.S. military installation where pilots command the U.S. military's UAVs (Unmanned Aerial Vehicles), Creech AFB in Nevada, has been infected by a virus. The virus is apparently logging keystrokes but is not interfering with the pilots' ability to continue performing the UAV missions. That's the good news. The bad news is the base IT personnel have been unable to clean the computers without wiping the hard drives and starting from scratch.
The Wired article linked above contains this quote: "We keep wiping it off, and it keeps coming back." That statement suggests one of two things to me: either the malware has installed a rootkit deep into the operating system's kernel, in which case cleaning the PC with standard tools will do you no good, or the malware is spreading on the network and the IT personnel have failed to find (and patch) the vulnerability that it is exploiting to do so.
Either way, I'd hate to be those IT guys right now.