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 10 United States Army." The branch was expected to perform those duties traditionally associated with their specialty—controlling the movement of traffic both in the battlefield area as well as in camps, posts, and stations; safeguarding soldiers from violence or accidents; recovering lost, stolen, and abandoned property within the Army; and relieving combat organizations of the custody of prisoners of war and operating the prisoner-of-war system—along with some new military duties, including assisting in destroying hostile airborne troops when combat troops were unavailable or inadequate to the task.

The enforcement of military laws and regulations, the maintenance of order, and the control of traffic remained the most important wartime duties of the military police. But as usual in wartime, the corps was also expected to assume some duties more usually associated with civilian law enforcement. These included protecting designated buildings, public works, and localities of special importance from pillage, sabotage, and damage; supervising and controlling the evacuation and repatriation of civilian populations; assisting in the enforcement of gas defense, passive antiaircraft measures, and blackouts; and performing security investigations and other general measures for security and secrecy.

To perform military police responsibilities in the field, the War Department authorized larger military police units, with the battalion (later in the war it changed to group) prescribed as the largest unit in higher headquarters. It created the position of provost marshal general to serve on the staff of these headquarters to assist the commanders "in the supervision and operation of police matters." Describing it as a wartime measure, the War Department also authorized the appointment of a provost marshal general at each general headquarters or theater of operations and on the staff of all divisions and higher units. In distinction to those serving in the tactical units, these general headquarters officers, with certain exceptions, were assigned to the special staff and exercised no command function over the military police units in the command.

The War Department initially organized three new battalions and four separate companies of military police from already existing assets. It also transferred all officers and enlisted men performing military police duties as well as all units performing such functions to the new corps. As a consequence, by mid-1942 the number of military police units had increased to seventeen battalions organized under the tables of organization. By that time, as the Army was rapidly expanding toward its full wartime strength, military police companies had become increasingly specialized as planning became more sophisticated. Some served exclusively as zone of interior guards, escort guards, and post, camp, and station garrisons. Others focused on duties relating to prisoners of war or in security processing while still another large number of companies became exclusively involved in criminal investigations. The corps, which started with a paltry 2,000 men in 1941, grew to a strength of more than 200,000 during the course of the war.

As a result of the rapid expansion of the military police and the ever-increasing need for trained personnel, the corps created the Military Police Service School at the Arlington Cantonment, Fort Myer, Virginia, on 19