Is there really a Taco Bell in the pentagon ?

Answer 1

Also, Baskin Robbins, Subway, KFC, McDonald's, Burger King, Popeyes—and of course, Dunkin Donuts and Starbucks to keep everyone well fed. 

Answer 2

There is a Taco Bell which lists it location as "The Pentagon, Washington DC"

https://foursquare.com/v/taco-bell/4f7dd9c37bebffc...

So it appears so. 

Also a MacDonald's (concessions Pentagon).