If you click on the skill bar at the top of the screen when you are playing the game it lists all the rewards at each level.
After you reach RA you don't get anymore BO slots (as far as I can remember). That might change when the level cap is increased, but we don't know when that'll happen.
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After you reach RA you don't get anymore BO slots (as far as I can remember). That might change when the level cap is increased, but we don't know when that'll happen.