We just launched the JLENS at APG. It's mission is to defend the White House...
http://www.army.mil/article/140245/...etecting_aerostat_at_Aberdeen_Proving_Ground/
http://patch.com/maryland/aberdeen/blimp-aberdeen-proving-ground-launching-soon-0
http://www.army.mil/article/140245/...etecting_aerostat_at_Aberdeen_Proving_Ground/
http://patch.com/maryland/aberdeen/blimp-aberdeen-proving-ground-launching-soon-0