High score reward
Activision used to reward players by sending them a fabric patch if sent them proof that player achieved a certain high score on the game (ie. a photograph of the high score).
In this case: 10,000 points. The patch name for the Chopper Command membership was called "Commandos". This was reached on the "Cadet" level. Here is a picture of that patch at AtariAge.
Information also contributed by Guy Chapman
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Trivia contributed by Indra was here, LepricahnsGold, Patrick Bregger.