Yes, it happened. I have two problems with conspiracy theories. The first is a quote from Benjamin Franklin. "It is entirely possible for three men to keep a secret, providing two of them are dead". The second problem I have with conspiracy theories is that it gives government too much credit. I've been working for the government for almost 20 years now, and I would be hard pressed to believe that the same government that can lose a 72 ton M1 Abrams tank can organize a conpiracy on that level. (Or any level, for that matter)