At this time, the corps was supplied with motor vehicles (including armored cars, light tanks, motorcycles, motor-tricycles, and automobiles).

It was located in police headquarters of major cities like Tripoli, Benghazi, Asmara, Addis Ababa, Mogadishu, Gondar, or in small commissariats otherwhere.

Part of the PAI personnel was mounted on Moto Guzzi motorcycles, with many armed with the Beretta M1938A 9mm sub-machine gun.

During World War II, the PAI fought as a combat unit alongside the Royal Italian Army.

For the garrison of the Libyan littoral way, at the outbreak of the conflict two companies on motorcycles and an armored car were assigned to the Exploring Unit of the CAM (Corpo armato di manovra) Battalion "Romolo Gessi".

Several units participated in war actions, at Tripoli, Benghazi, Barce, but the details regarding effective employment are insufficient.

After the Armistice of Cassibile, the evening of 8 September 1943 the PAI participated to the defense of Rome engaging the first conflict with the Germans at Mezzocammino, near Castelfusano, with troops of Carabinieri, in aid to a garrison of Grenadiers of Sardinia.

The commander and founder of the PAI, General Marraffa, was captured by the Nazis and deported to the Dachau concentration camp, where he died.