UFOs

"I can hear the ships but I can't find them. You think they're using cloaking devices?"

- Ron Jakowski UFO spotting

UFOs (unidentified flying objects), also known as "flying saucers" or "flying discs", are alien interstellar spacecraft in Grand Theft Auto V.

Description
So far, two types have been discovered,Three of them look identical. They have a dark body and several lights of varying colors on them, while the top side has FIB markings.

One of the UFOs looks like a stealth aircraft, with a body resembling the real world B-2 Spirit, but with many flat panels extending out in all directions and forming a rough circular shape. This UFO also seems to emit loud noises; if you get near it, it will emit a incredibly loud screech, and the screen will begin to distort.

At this time, there are no known ways of acquiring or piloting any of them. The UFO above Fort Zancudo seems to be protected by force-fields, or something similar, as the player can be thrown away from it while trying to parachute to the top. The others will slowly fade away when approached.

Locations
They can not be seen from a great distance, so a bit of searching is needed.
 * FIB markings version - Appears at the top of Mount Chiliad after achieving 100% Completion in GTA V.
 * FIB markings version - Above Sandy Shores.
 * FIB markings version - At the bottom of the sea, off the northern coast of Paleto Bay. Reachable by Submarine.
 * Unique version - Above the Fort Zancudo military base. Much higher than some clouds.

Possible origin
There's not much proof of who really owns them and why, but there are multiple theories.
 * They could all belong to the same Aliens.
 * The type with FIB markings could be an easter egg to movies and myths that some seeming government agencies are really co-operating with the saucer people. Search for "reptilian" aliens for more info about these beliefs. Many pedestrians in GTA San Andreas, as well as GTA IV and EfLC often ramble about these reptilians.
 * Some believe that the US government secretly operates advanced saucer-type stealth aircraft from the Area 51 military base. The unique one above the military base is likely an easter egg to this.