Final answer:
The provided reference information does not specify the year the Surgeon General received permission to adopt the former Medical Corps coat of arms as the AMEDD's Regimental Insignia.
Step-by-step explanation:
The year in which the Surgeon General received permission for the Medical Department to adopt the former Medical Corps coat of arms as the AMEDD's Regimental Insignia is not explicitly stated in the provided reference information. The reference information does cover historical events from the World Wars and the evolution of medical services, which implies a connection to military medical history, but it does not directly answer the question about the AMEDD's Regimental Insignia.