Add Yahoo as a preferred source to see more of our stories on Google. US Air Force Bell UH-1P helicopters from the 20th Special Operations Squadron fly into Cambodia in 1970. US Air Force/Capt. Billie ...

Add Yahoo as a preferred source to see more of our stories on Google. US Air Force Bell UH-1P helicopters from the 20th Special Operations Squadron fly into Cambodia, around 1970. US Air Force/Capt.

For almost 40 years, their story could not be told. Their Vietnam War missions were so secret that the U.S. top brass could not or would not talk about them -- until now. Thousands of American ...