I've promoted my first Bo , he is a science officer on my escort ship.
After that in his skill tree has appeared a new column. In the assignemnt tab i can see that
for the ground he got a second ability other that what he had before.
But for space the second ability (Tractor Beam II) looks gray , not active. I see the simbol but it is not active.
Different ships only allow your bridge officers to use some of their skills. The are forbidden by the ship to use what they know because they are on a ship that only allows them to use the first skill they learned. Get a Science ship and they will magically remember their other science skills and can use it, but then the Tactical officer sadly forgets some of his skills.