The Indian Medical Service (IMS) was a military medical service in British India, which also had some civilian functions. It served during the two World Wars, and remained in existence until the independence of India in 1947. Many of its officers, who were both British and Indian, served in civilian hospitals. Among its notable ranks, the IMS had Sir Ronald Ross, a Nobel Prize winner, Sir Benjamin Franklin, later honorary physician to three British monarchs and Henry Vandyke Carter, best known for his illustrations in the anatomy textbook Gray's Anatomy.