Spock/Appendices/Background information/Rank

Spock is referred to as a lieutenant commander in , though the final draft and revised final draft of that episode's script instead referred to him as a full commander. The listed Spock as having been promoted from lieutenant commander to full commander following "Court Martial". However, in a captain's log entry made by Kirk in , Spock is still identified as a lieutenant commander, as he is again in . Spock was first referred to as a commander in . Throughout all his appearances on The Original Series, Spock wore the rank stripes of a full commander.
Near the end of the episode , Spock dons his Starfleet uniform for the first time in that show, wearing lieutenant junior grade stripes. However, in the earlier episode , Spock identifying himself as a lieutenant. "Lieutenant" is the proper way to address lieutenant junior grades as well as full lieutenants, however, Spock was stating his own rank while being questioned by Admiral Cornwell and thus would have used his full rank. In , Spock was still identified as a lieutenant and wore the correct insignia.