UFOs and Government Cover-ups, ETc.

http://aliencasebook.blogspot.ca/2009/02/videos-history-of-us-presidents-on-ufos.html ,

https://www.amazon.com/UFOs-Generals-Pilots-Government-Officials/dp/0307717089/ref=as_li_tf_sw?&linkCode=wsw&tag=uv777bk1-20

Sightings & encounters go back deep into history.
www.ufoevidence.org/topics/presidents.htm, www.bibleufo.com/quotepres.htm ,
www.thetruthbehindthescenes.org/aliens-living-among-us , www.bibliotecapleyades.net/sociopolitica/esp_sociopol_bush02.htm, http://english.pravda.ru-ufo

In the sky, underground or even underwater, UFOs are seen almost anywhere.

USAF 509th_Operations_Group#Insignia , 

http://en.wikipedia.org/wiki/509th_Composite_Group ,
http://desertdarkness.blogspot.com

http://radiomisterioso.com/2011/07/07/kenn-thomas-jfk-and-ufo , 
www.dailymail.co.uk/news/article-1378284/Secret-memo-shows-JFK-demanded-UFO-files-10-days-assassination.html