Here is one place to access the official UFO report. It says next to nothing, and is almost not worth the time. It was clearly typed out in a few hours by a summer intern. Like any good research report that concludes nothing, the authors would like to collect more data, they would like to do further studies, and they would like someone to pay for that.

Anyway, here are the possible explanations they give for UFOs:

• airborne clutter: birds, balloons, “recreational unmanned vehicles”, and plastic bags
• natural atmospheric phenomena: ice crystals, moisture, thermal fluctuations (because these things can show up on sensors)
• “USG or Industry Development Programs”: they don’t bother to define USG, but I am thinking United States Government. “We were unable to confirm, however, that these systems accounted for any of the UAP reports we collected.”
• Foreign Adversary Systems: “China, Russia, another nation, or a non-governmental entity”, such as a Bond villain. Okay, I added that last one.

Conspicuously missing from the list is aliens, a previously undiscovered deep-sea civilization exploring our atmosphere (see Charles Stross’ Laundry Files series), or entities operating in parallel universes (see Charles Stross’ Merchant Princes series). I have no evidence for any of these theories, which is to say I have exactly the same amount of evidence presented in this report in support of the theories above. My recommendation is to spend your time reading science fiction/fantasy series by Charles Stross rather than this report. You will be much more entertained, and no less informed.