Really?  What about sales taxes they pay in retail stores?  How about the rent monies they pay when they can't get base housing or don't want to live in base housing?  How about the annual vehicle registration fees they pay for their vehicles.  How about the retail goods and merchandise they buy from the local economy that stimulates business and the local economy.  

Now lets address the Boeing pipe dream.  Do you actually believe that most Boeing employees will travel daily during their work week to Everett, the closest Boeing plant to the island?

Then take a look at all the military retirees that live in the area.  They don't live on base so they must have somewhere to live, usually a home sitting on property.  And no, they don't exclusively shop on base and frequently shop in the local retail environment and pay all of the same taxes that you do.  

I have personally witnessed base closures and the local economy tanks shortly afterwards.  Is that what you want for our count?