Once you learn to drive a tank or helicopter you never forget. You can upgrade those abilities to make Alex more effective with them. The Air Strike is a different story. You only get a certain amount. When you first learn how to call them in, you only have one. After you use that one, you have to find a Base Commander and consume him to refill it. As the game progresses you can call in more. I think the max is three at a time. The only caveat is that you have to be disguised as a Military member when you call it in. Hope that answers your question.

A question: you mentioned that Alex gains abilities (like tank operation or air strikes) if he consumes certain individuals. After you consume that person do you keep that ability for the rest of the game or does it force you to consume another commander each time you decide you’d like to call in an air strike?