My tactical officer has high yield torpedo III and can't use it. She is currently a commander.
You have to have the console slot that allows you to use the skill. If you don't understand what I'm talking about, you need to do some research on ship consoles (its a whole subject unto itself).
In a nutshell ... he/she could be an Admiral ... but if your ship only allows Ensign skills at the position where you have him/her assigned, she won't be able to use any skill above Ensign (the first column).
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You have to have the console slot that allows you to use the skill. If you don't understand what I'm talking about, you need to do some research on ship consoles (its a whole subject unto itself).
In a nutshell ... he/she could be an Admiral ... but if your ship only allows Ensign skills at the position where you have him/her assigned, she won't be able to use any skill above Ensign (the first column).
I recommend you study this ship chart and understand it.