Rear Admiral, 1923
Flag of a Rear Admiral, 1923. The blue field is displayed only by the senior of the rank present. A junior in the presence of a senior of the same rank, displays a similar flag with a red field.
Hydrographic Office of the U. S. Navy, International Code of Signals, American Edition (Washington: Government Printing Office, 1923)plate II
Courtesy the private collection of Roy Winkelman