Has anyone read these books by Robert Doherty? Doherty is supposed to be a penname for a famous writer of techno-thrillers. Anyway, in the series, it is discovered that the US government has been finding and using UFO technology since the 40's. However, as the series progresses, it is found that the aliens are still here and have been effecting our history for the last 5000 years or so. I don't want to give too much away. In general they are a fun, fast read.
Torqumada