The Dr. Linda Christian character is wearing a uniform with a mixture of officer collar pins and enlistment sleeve patches. Also, she is a Marine, the Marine Corps does not have medical personnel; that is provided by the Navy's Medical Corps.
Linda Christian claims that the virus causes hemorrhaging from the eyes, nose and other soft tissues and projectile vomiting. There's no projectile vomiting or hemorrhaging when the submarine crew is exposed. They just keel over and die without any of the many symptoms described.