After the war, the CID was once again decentralized, with control of criminal investigations transferred to area commands in the 1950s and further down to the installation level in the 1960s. A Department of Defense study in 1964 entitled "Project Security Shield" made clear that complete recentralization of the Army's criminal investigative effort was needed in order to produce a more efficient and responsive worldwide capability. Beginning in 1965, criminal investigative elements were reorganized into CID groups corresponding to geographical areas in the United States. In 1966, the concept was introduced to units in Europe and the Far East. However, this arrangement did not fully resolve all the coordination problems, and in 1969, the U.S. Army Criminal Investigation Agency was established to supervise all CID operations worldwide.