To get away from the myriads of computer acronyms, I present yet another version of NAS:

Naval Air Station

NAS North Island (NASNI), located off of San Diego on the semi-island of Coronado, is a major hub of US Navy aircraft. In particular, there are many squadrons of helicopters, including Helicopter Anti-Submarine Light 43 (HSL-43), where I was stationed for a while. When the President visits southern California, they typically land Air Force One on NASNI. This causes much strife for the folks who live in Coronado, since the Secret Service closes down the Coronado Bay Bridge so the motorcade can traverse it.