The "Great Americans" project has an interview with retired Major General Eldon Bargewell. During his career Bargewell served with MACV-SOG (Reconnaissance Team Viper) as an enlisted man, receiving the Distinguished Service Cross. As an officer he served most notably with the 75th Rangers, as commander of the Delta Force, and as operations officer for MNF-I.
The interview begins with the Vietnam days. It's worth watching for Sergeant Major Billy Waugh's commentary alone. Of course you all know who he is.