If it is a by the AMA contest rules event... its class A or AA or AAA.

If its a "club rules" event (Fun flys and "big bird" fly-ins or similar) then its class C.

since you have one portion of your contest following the AMA rulebook event for RC combat... you have a Class A event.

(AA is a BIG event... and AAA is the NATS.)

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BTW.. an A event "reserves" your date(s) over a wider geographic area than a C event... so be happy! there's a larger radius that is excluded from others sanctioning RC combat events on your date... so more people are likely to come to YOUR contest. (thats the whole purpose behind the santion... reserve the date within your area.)