Find a tactical captain who can train that ability and have them train a basic tactical officer, then trade the officer to you. Then you can use that officer to train one of your current ones.
At present, it is not possible to trade BOffs that are members of your crew. Therefore, it is not possible to train one of your active officers and then transfer to another captain.
The only way to train your BOffs with level III skills outside of your own career path is to have another BOff with that skill train it. Those BOffs show up as mission rewards or get assigned to you by the Personnel department on a semi-random basis.
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The only way to train your BOffs with level III skills outside of your own career path is to have another BOff with that skill train it. Those BOffs show up as mission rewards or get assigned to you by the Personnel department on a semi-random basis.