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A friendly reminder regarding spoilers! As always, the expanded Trek universe is in a period of major upheaval with the continuations of Strange New Worlds and Prodigy, the advent of new eras in gaming with the Star Trek Adventures RPG and Star Trek Online, as well as other eventful releases such as Section 31, the ongoing IDW Star Trek comic and spin-off Star Trek: Defiant. Therefore, please be courteous to other users who may not be aware of current developments by using the {{spoiler}}, {{spoilers}} OR {{majorspoiler}} tags when adding new information from sources less than six months old (even if it is minor info). Also, please do not include details in the summary bar when editing pages and do not anticipate making additions relating to sources not yet in release. THANK YOU

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Memory Beta, non-canon Star Trek Wiki

Acting ensign is a provisional rank occasionally given to individuals at the discretion of their commanding officers.

In 2253, Captain Christopher Pike made cadet Spock an acting ensign when he accepted the role of science officer on the USS Enterprise. (EV comic: "Flesh of My Flesh")

In 2364, Captain Jean-Luc Picard of the USS Enterprise-D rewarded the promising young Wesley Crusher with the rank of acting ensign. (TNG episode: "Where No One Has Gone Before")