Yes, a young man portrayed a Union provost guard, staying completely in character and explaining to us visiting "civilians" about his experiences in the war and what Appomatox was like in July, 1865. He did a fine job. They also do that at Gettysburg, where a young "Irish" soldier from a Pennsylvania regiment visited the cemetery there to look for a fallen comrade and talked to the visitors, becoming properly emotional as he described what it was like defending against Pickett's Charge.