Re: IDW Star Trek Ongoing...
Chekov Prime was ill-equipped to be security chief too (he was naive and more interested in scientific trivia than security protocols and he was always geting beaten up) but he did make a competent bridge tactical officer.
Chekov Prime is also a completely different character from the Abramsverse version and was also 25-30 years old when made security chief in the Prime timeline. Uhura would make a far more convincing security chief in the new universe.
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