The Secret International Agency on Alien Affairs
1977 was a cosmic year with the release of Star Wars and Close Encounters of the Third Kind. In the latter a fictional flag appears that represents the government agency responsible for the study, coordination, and cover up of extra terrestrial alien civilization.
The flag consists of a white background with the agencies logo centered in the middle. The logo consists of a black isoceles triangle with the words 'MAYFLOWER' written along the bottom and a radiant light blue star near the apex.
The International Alien Agency Flag
in between the US and French Flags
in between the US and French Flags
Apparently in this movie the French and US government are working together under the 'black triangle' flag to study and welcome extra terrestrial life to earth. The triangle is already an important symbol in the US as the 'Eye of Providence,' which can be found on the back of a US dollar bill.
Notice the 'triangle' agency alien flag is centered, while three alien aircraft hover overhead. In the upper left are blue lights, the upper right are red lights, and a small ship or probe is over the runway.