Here's the memo Maurice
is referring to:
TO: Bill Theiss
FROM: Bob Justman
SUBJECT: STARSHIP EMBLEMS
DATE: December 18, 1967
Whilst sitting in Dailies today, it was noticed that a Starship Captain (from another Starship) was wearing an emblem unfamiliar to yours truly. I have checked the occurences out with Mr. Roddenberry, who has reassured me that all Starship personnel wear the Starship emblem that we have established for our Enterprise Crew Members to wear.
Doubtless this situation has arisen due to the fact that a different Starship emblem was used last season on “CHARLIE X”. However, the personnel of that other ship in that show were the equivalent of merchant marine or freighter personnel -- and therefore not entitled to bear this proud insignia on their individual and collective breasts.
Please do not do anything to correct this understandable mistake in the present episode. However, should we have Starfleet personnel in any other episodes, please make certain that they were the proper emblem.
Under penalty of death!
Signed this 18th day of December, in the year of our Lord, 1967, by
ROBERT H. JUSTMAN
CC: Gene Roddenberry
John M. Lucas
P.S. A carven “I’m sorry!” will be sufficient.
IOW, the "ships all have their own insignia" was a ret-conned explanation by the producers to rationalize away inconsistencies and mistakes in TOS.
That pretty much blows a whole bunch of "canon" out of the water.
It also helps to explain the establishment of the delta as the Starfleet emblem in ST:TMP - Roddenberry was actually reestablishing what he and the other producers had intended
to be the status quo from the beginning.