I found a truly fascinating website with a radio broadcast about an American warship called the USS Liberty. The Liberty was attacked by Isreal during the 6 day war (1968), and the whole thing was covered up at the HIGHEST LEVELS of government.
The guest on the broadcast is a crewmen from the liberty who explains why Johnson covered it up and why he ordered three separate Navy Admirals to turn-around there rescue flights while American Navy-men were dying in that attack!
Here's the link to the broadcast...
http://steelonsteel.com/audio/default.html