First aid is required. I'll paraphrase the standard for you which says basically PADI Rescue Diver course student diver(s) must successfully complete a sanctioned course within the past 24 months in cpr and basic first aid. AED is not required but can be taught during the EFR course if the instructor is certified to teach it. I don't know why you were not required to have it Selkie as the Instructor Manual I am using is a 2007 copy and that is where the paraphrase above came from. The EFR covers the basic skills which I am sure you have as a DVM anyway. Bandages, shock, bleeding control etc.