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The only field I know of which is that way is OXCC which is near Chesapeake City, MD.
It is pretty much on the line of MD and northern Delaware. Although they don't host strictly airsoft games they have pick up games once a month and every once and awhile host "OPs" which are fun none the less.
http://www.oxcc.com/
Keep an eye on their calender for when the airsoft games are running.
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