9/11 Commission Report — Chapter 3
“ Intelligence agencies under the Department of Defense account for approximately 80 percent of all U.S. spending for intelligence, including some that supports a national customer base and some that supports specific Defense Department or military service needs.66 As they are housed in the Defense Department, these agencies are keenly attentive to the military’s strategic and tactical requirements. One of the intelligence agencies in Defense with a national customer base is the National Security Agency, which intercepts and analyzes foreign communications and breaks codes. ”
