Redneck, I probably wasn't clear in my original advice to the OP. I agree 100% that no one needs "permission" from local law enforcement to play airsoft. I was simply commending the wisdom of giving notice to the local LEO's of what you'll be doing on the field, so that if/when a complaint comes in, it's not out of the blue for them as to what's going on. Either way, the main issues are permission from the field owner and other legalities and logistics of set up.
Now, considering that the OP has fallen silent in the thread, I'll follow suit