As a result, fans of the series are left with conflicting visual information regarding the meaning of the insignia worn throughout the original series.
Theiss’ inclusion of an alternate insignia for the Exeter's captain, and chief medical officer unfortunately downplays how genuinely ubiquitous the delta insignia is within the Star Trek universe. This memo, written during the production of the episode " The Omega Glory" and referencing Captain Ron Tracey, nullifies the long-held assumption that Starfleet assigned different insignia shapes to starships during TOS.