Robert A. Lovett, United States Secretary of Defense, issued a memorandum establishing the National Security Agency, with responsibility for all communications intelligence for the government.

Robert Abercrombie Lovett was an American politician who served as the fourth United States Secretary of Defense, having been promoted to this position from Deputy Secretary of Defense. He served in the cabinet of President Harry S. Truman from 1951 to 1953 and in this capacity, directed the Korean War. As Under Secretary of State, he handled most of the tasks of the State Department while George C. Marshall was secretary.

The National Security Agency (NSA) is an intelligence agency of the United States Department of Defense, under the authority of the director of national intelligence (DNI). The NSA is responsible for global monitoring, collection, and processing of information and data for global intelligence and counterintelligence purposes, specializing in a discipline known as signals intelligence (SIGINT). The NSA is also tasked with the protection of U.S. communications networks and information systems. The NSA relies on a variety of measures to accomplish its mission, the majority of which are clandestine. The NSA has roughly 32,000 employees.

Signals intelligence (SIGINT) is the act and field of intelligence-gathering by interception of signals, whether communications between people or from electronic signals not directly used in communication. As classified and sensitive information is usually encrypted, signals intelligence may necessarily involve cryptanalysis. Traffic analysis—the study of who is signaling to whom and in what quantity—is also used to integrate information, and it may complement cryptanalysis.