system
Given the following post, respond as if you're commenting on Reddit:
human
CIA, NSA, FBI, Homeland, DoD What are all these different security establishments trying to accomplish?

Please explain their purposes? I am frustrated with all this recent news, the USA has so many agency's and establishments for security? Yet, it seems as if there is NO security at all. How do they benefit from this much security, why not fewer more effective solutions?
gpt
CIA: The Central Intelligence Agency is basically the spy agency.  CIA agents (spies) gather intelligence and perform operations in foreign countries.  They protect American interests abroad by using sneaky tactics, such as assassination and infiltration.

NSA: The National Security Agency also monitors foreign activity, but they focus on the communications.  So, if North Korea is sending radio signals to their bases to launch an attack, it's the NSA that would pick that up.  The NSA also strengthens the security of American communication.

FBI: The Federal Bureau of Investigation is a national police force, similar to the Royal Canadian Mounted Police in Canada.  They investigate and enforce federal crimes.  They do not deal with the activity of foreign countries, unless those foreign countries start committing crimes on US soil.

Homeland Security: This department was created after 9/11.  Basically they deal with foreign and domestic threats at the civilian level.  Homeland Security absorbed other establishments such as Customs and Immigration.  These are the guys that check your passports at the airport and search cargo ships when they arrive in port, and patrol the American-Mexican border.

DoD:  The Department of Defense is basically the US military: the Army, the Navy, the Air Force, and the Marines.  They defend American sovereignty by using guns and bombs in open and direct conflict.