This article is about the United States agency. For other countries’ agencies, see Defence Intelligence Agency. “DIA” redirects here. For other uses, see Dia. Defense Intelligence Agency 140px Seal of the DIA Agency overview Formed 1 October 1961by Robert McNamara Headquarters Defense Intelligence Analysis Center, Joint Base Anacostia-Bolling Motto Committed to Excellence in Defense of the Nation Employees ClassifiedEstimated Approx.