Known for its distinctive five-sided shape, the Pentagon is located in Virginia and houses all the branches of the armed forces (except for the Coast Guard). This includes the intelligence branches of the Army, Navy, Marines, and Air Force and the Defense Intelligence Agency, all of which belong to the Intelligence Community. The Defense Intelligence Agency collects military intelligence in support of the Joint Chiefs of staff, and the Army, Navy, Marines, and Air Force collect tactical intelligence in support of their respective services. The Secretary of Defense is Robert M. Gates. The 60-year-old Pentagon is one of the largest buildings in the world.