Free series of video lectures on U.S. Army Heritage & Education Center website. There are buttons for either playing or downloading the lectures. I had trouble getting the download buttons to work properly, but had no trouble playing the videos. Lectures can be an hour in length or more, so dial-up users may wish to avoid:
Examples: The Devil's Own Work: The Civil War Draft Riots and the Fight to Reconstruct America. Barnet Schecter, Historian.
Across the Elbe River with the Thunderbolt Division. Tony Vaccaro, WWII Veteran.
Tuskegee Airmen of the 332nd Fighter Group. Alexander Jefferson, WWII Veteran.
We are Soldiers Still: a Journey Back to the Battlefields of Vietnam. Joseph L. Galloway, Independent Scholar.