It sounds like at least some people in our government take UFOs seriously. I'm a bit skeptical, but anything's possible!
The cable states: "It is critical all embassy staff understand that they are not to discuss under any circumstance concerns DOD has with UFOs entering orbit, once again the seriousness of this matter cannot be overstated"
The cable was sent on 9 November, 2005 by the State Dept to a diplomat connected to the US embassy in Kiev, Ukraine. As it implies, the State Dept was concerned with diplomats with loose tongues chatting about UFOs at cocktail parties and conceding that the US does allocate resources to the matter.
LINK: http://io9.com/5736880/wikileaks-cable-about-ufos-revealed