With the onset of World War II in December 1941, the armed forces rapidly swelled in size and the Army once again became a force of millions, and the need for a self-policing law enforcement system rematerialized. However, by early 1942, investigations of crimes committed by military personnel were still considered to be a "command function" to be conducted by local military police personnel. The Office of The Provost Marshal General felt that the agents in the Investigations Department were not properly trained for criminal investigations, the only investigations taking place at the time being personnel security background investigations for individuals being considered for employment in defense industries. As the Army had expanded, the crime rate had risen, and local commanders did not have the personnel or resources to conduct adequate investigations. By December 1943, the Provost Marshal General was charged with providing staff supervision over all criminal investigations, and a month later in January 1944, the Criminal Investigation Division was reestablished under the Provost Marshal General's Office. The organization exercised supervision over criminal investigation activities, coordinated investigations between commands, dictated plans and policies, and set standards for criminal investigators.