The US is sending these weapons to Syria.

A UFO (Unidentified Flying Object) is an object in the sky whose nature and origin are not immediately apparent to the observer. There is a common belief that UFOs are necessarily of extraterrestrial origin. It is precisely these kinds of claims about UFOs that elicit the greatest skepticism. Many of these unidentified objects, upon serious investigation, turn out to be rationally explainable phenomena. However, there are also those about which even military pilots and experts prefer to remain silent...