Secondary is checked to all it to use it at the same time as primary. You can set rockets to secondary as I have done and it'll fire guns and rockets at the same time. Awesome when the AI takes out a convoy. Setting all air-to-air cannons to secondary would allow it to use it no matter what, which would probably be better, don't know never tried it, but I was told I should have done that with GR6. Any insight?
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