I'd have to suppose that the only possible logical explanation would be line up markers but that is hard for me to swallow.
Major UFO Breakthrough in Brazil
22-May-2005
AJ Gevaerd and Brazilian Air Force Official
The nation of Brazil is relaxing its policy of UFO secrecy. It is the first among a number of countries known to be considering the idea of abandoning the secrecy mandate that has been in place worldwide since the phenomenon first began to be publicly known nearly fifty years ago.
A.J. Gevaerd of the Brazilian Committee of UFO Researchers reports that a number of important files have just been released, including a folder containing documents from 1977 that cover dozens of cases of UFOs in the Amazon with over 100 pictures made during Operation Saucer, an official Brazilian military investigation that was carried out between September and December, 1977.
This change in policy means that one of the countries with the most extensive amount of UFO activity is now going to share its previously secret knowledge with the public. To read Mr. Gevaerd's statement, click on full story.
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http://www.unknowncountry.com/news/?id=4618