Defense Advanced Research Projects Agency: Overview and Issues for Congress [Updated March 17, 2020] [open pdf - 1MB]
From the Summary: "The Defense Advanced Research Projects Agency (DARPA), established in 1958, is an agency within the Department of Defense (DOD) responsible for catalyzing the development of technologies that maintain and advance the capabilities and technical superiority of the U.S. military. DARPA-funded research has made important science and technology contributions that have led to the development of both military and commercial technologies, such as precision guided missiles, stealth, the internet, and personal electronics. DARPA has a culture of risk-taking and tolerance for failure that has led experts, some Members of Congress, and others to view DARPA as a model for innovation both inside and outside of the federal government."
CRS Report for Congress, R45088
Congressional Research Service: https://crsreports.congress.gov/