This is an outstanding conversation between Supervisory Ranger Chris Gwinn and Brigadier General [Ret.] Ty Seidule over BG Seidule’s book, Robert E. Lee and Me.
The video’s description reads, “Ty Seidule grew up revering Robert E. Lee. From his southern childhood to his service in the U.S. Army, every part of his life reinforced the Lost Cause myth: that Lee was the greatest man who ever lived, and that the Confederates were underdogs who lost the Civil War with honor. Now, as a retired brigadier general and Professor Emeritus of History at West Point, his view has radically changed. From a soldier, a scholar, and a southerner, Ty Seidule believes that American history demands a reckoning.”
The program starts at the 2:51 point.
Student of the American Civil War 
US Army not Union Army; I like that. If we call it the Union Army the opposition should be called the Slavery Army