During the national security briefing, the National Security Advisor refers to Jack Ryan as "Dr. Ryan". Once he puts out to sea, everyone calls him "Mr. Ryan". Also, the conversation in the captain's cabin, aboard the aircraft carrier, makes mention of Jack Ryan graduating from "The Academy" and as "A Marine". Even if they can't agree on whether to call him Dr. or Mr., shouldn't he be addressed by rank (Captain, Major, Lieutenant, etc) ?
Badger Bill