Spy Imagery Agency Watching Inside U.S. (AP) AP - In the name of homeland security, America's spy imagery agency is keeping a close eye, close to home. It's watching America. Since the Sept. 11 attacks, about 100 employees of a little-known branch of the Defense Department called the National Geospatial-Intelligence Agency  #151; and some of the country's most sophisticated aerial imaging equipment  #151; have focused on observing what's going on in the United States.