Intense Congressional review during 1975–76 created turbulence within the Intelligence Community. The Murphy and Rockefeller Commission investigations of charges of intelligence abuse ultimately led to an Executive Order that modified many Intelligence Community functions. At the same time, with U.S. involvement in Vietnam ending, defense intelligence faced a significant decline in resources. During this period, DIA conducted numerous studies on ways of improving its intelligence products. Despite these and other Community-wide efforts to improve intelligence support, the loss of resources during the 1970s limited the Community's ability to collect and produce timely intelligence and ultimately contributed to intelligence shortcomings in Iran, Afghanistan, and other strategic areas.