photo:By Source (WP:NFCC#4), Fair use, https://en.wikipedia.org/w/index.php?curid=49195613
photo: “Flag of the National Security Agency” by National Security Agency (NSA) – This file was derived from: Flag of the United States National Security Agency.svg. Licensed under Public Domain via Wikimedia Commons.
photo: “Nsa sign” by National Security Agency – http://www.nsa.gov/about/_images/pg_hi_res/nsa_sign.jpg – http://www.webcitation.org/6HaJrLHkZ, listed at http://www.nsa.gov/about/photo_gallery/gallery.shtml – http://www.webcitation.org/6HaIHooHu. Licensed under Public Domain via Wikimedia Commons.