I want to know the answer to the following question:
What is the second-largest employer in Tucson?
All the background I'm provided with is that "Its presence, as well as the presence of the US Army Intelligence Center (Fort Huachuca, the largest employer in the region in nearby Sierra Vista), has led to the development of a significant number of high-tech industries, including government contractors, in the area.". Is that enough to answer the question?