The disclosure UFO in washington DC makes you think ah um is it ours, a very unusual drone. This would acount for maybe 30 % of sightings. Stanton friedman is having a stroke.

http://news.yahoo.com/blogs/lookout/military-drone-mistaken-ufo-d-c-beltway-165952026.html

Northrup Grumman drone please note complete lack of wings aerolons ,elevators, rudder, air intake, the russians are gonna be on the drawing board for a long time trying to copy this one.
ONE UFO accounted for....