I believe the facility has ATC Mon-Fri and Ground to Air at the weekend ...but I could be wrong on that , can someone confirm.
As for the fence ..... if you have a good few heli's on site wouldn't you want the facility fully fenced ..... just to stop trespassers
I visit the US regularly , access at many airfields used to be non fenced in certain areas which was great at the time ( I wish it still was ) ...sadly it isn't now ....... times have changed since 9/11