Orbs

[Evidence of secret government craft and their silent cloaking/invisibilty ability.]

See: Invisibility  [2007] Drones: Military Reverses Alien Technology. The Most Important Information Released This Decade

Orbwar

http://www.chemtrailcentral.com/orbs.shtml

http://www.gallerize.com/What_Is_The_Hologram_Theory.htm

Silver Orbs, bugs or something else?

Stealth Fighter Hovers in Mid-Air and Cloaks