What changes did the national security agency act of 1974 make to the way the united states organized its military and gather information?

The National Security Act of 1947 ( not 1974 ) was a major reorganization of the Unites States governments military and intelligence agencies.

The Act merged the Department of War and the Department of the Navy into the National Military Establishment, headed by the Secretary of Defense. It created the Department of the Air Force and protected the Marine Corps as an independent service. The purpose of this act was to unify the Army, Navy and Air Force into a federal structure.

The Act also established the National Security Council for the coordination of issues of national security. Its goal was to advice the president on domestic and foreign security policies. The Act created the Central Intelligence Agency (CIA), the U.S. first peacetime intelligence agency.

explanation: we can only guess at how our actions may be perceived in the future. doing something really big like killing lots of people, saving lots of people, affecting the lives of lots of people is a sure fire way of being remembered in historical records. we can also make a difference in the history records by being a small influence on something bigger, whether that is as a civil servant, scientist or artist.

of course you could argue that we all affect history just as tiny cogs in a   bigger machine.

if you mean how do people influence our opinions of things which have already happened, then simply by writing a book which looks at things form a different perspective and trying to convince people that this perspective is more accurate or truthful. people do it all the time i.e. richard the third was a terrible or was he? plenty would disagree, it's just that their views aren't the most widely known.n: