What does it mean, "on a three"?

Question

Mike calls for help when his partner detective Mike got shot down:

Mike: Three-fifteen. Shots fired. Officer down. Jose Marti Park. We need Air One on a three.

Johnny Bones · Accepted Answer

He's talking about a "Code 3".  In the US, a Code 3 means to respond with lights and sirens.
He's also asking for Air One backup, which is (as it sounds) support by air in the form of a helicopter.

What does it mean, "on a three"?

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