It looks like exactly two years after his heroism at Antietam, Medal of Honor recipient Richard J. Curran was promoted to full Surgeon.
From a Seneca County, New York newspaper in October 1864:
PROMOTED. – The many friends of Dr. Richard Curran, will be pleased to learn that he has been promoted and assigned to the position of Surgeon of the Ninth N.Y. Cavalry.
Friends of Surgeon Rulison, Dr. Curran’s predecessor, were probably not too pleased to learn that he had been killed.