Officer cards are attached to a crewman. They add their ability to that crewman.
Does this "addition" combine the two abilities into one, or are they two separate, trigger-able abilities?
If you stuck Science Officer on Mr. Spock, we have an example of a card that uses a scan token in two different ways. The core rules state only one card can make use of one token, so does Science Officer Spock become limited to choosing one of his abilities, or can he do them all off one token?
Finally, does Science Officer allow you to use multiple scan tokens at once, causing them all to modifier the enemy defence dice by -2 each?