Hello Anthony and welcome to Pagan Space.
Now about your questions. Need some info ok.
Do you want a local coven or an online one? I see your in the service, so if your deployed right now an online one would be your best bet, I do believe. But it's a personal preference ya know.
Also you should find a group that thinks the way you do. Have the same basic beliefs in their path as you do. Other wise you just won't be happy and be back to looking for a coven in no time.
I personally follow witchcraft. but no i am home now so i can do a local coven its just i really have no idea on how to find people that believe like me. people usually do not go around announcing their beliefs like that.
check out your local stores, ask around, do a online search like : Iowa pagan" see what you can come up with....and if you find something open up a dialog...and see what happens. Don't expect it to happen over night, be patient.....good luck ....