Unfortunately, my camera wasn't working, but to show you his attire I found a similar picture of him at a previous event he spoke at.
(credit to www.motherrudd.org)
General Thomas was a Virginian who attended West Point. While there, he became close friends with William Tecumseh Sherman, Ulysses S. Grant, and Robert E. Lee.
He served in several battles leading up to the Civil War. These included the Seminole Wars in Florida in 1841 and the Mexican American War in 1845. He taught artillery and cavalry at West Point in the 1850's which allowed him to select some of the best cadets for his units later.
When the Civil War broke out, he remained with the Union, feeling that his oath to the Constitution was more important than his native ties to Virginia. This caused his sisters to disown him. He commanded the Army at the first Union victory at Mill Springs (Logan's Run) in Kentucky. He never advanced as far as some of his contemporaries, largely because there was always suspicion about whether he was truly a Union soldier based on his origins.
It was a very interesting program about an early American Military hero that we don't hear much about.