http://www.helium.com/knowledge/147687-why-would-the-us-military-cover-up-ufo-sightings.xml Helium.com > Astronomy > Why would the US military cover up UFO sightings? en-us Copyright Helium.com Mon, 05 May 2008 19:39:55 GMT Mon, 05 May 2008 19:39:55 GMT