a suffix 'S' on the jeep's hood registration number. In 1943/1944, the Army shifted to FM radios, and new fittings were developed for those. At least fourteen Signal Corps Radio set fittings were standardized, including for the SCR-187, SCR-284, SCR-499, SCR-506, SCR-508, SCR-510, SCR-522, SCR-528, SCR-542, SCR-608, SCR-610, SCR-619, SCR-628, SCR-694, SCR-808, SCR-828, and VRC-l. Gun mounts Two of the original uses of the -ton trucks were reconnaissance and the support of infantry with machine guns. These roles led to the desire to mount automatic rifles, to be fired from the jeep. To mount either a .30-caliber M1919 Browning machine gun or .50-cal (12.7 mm) M2 Browning heavy machine gun, the M31 pedestal, a tubular pedestal with bracing in three directions, was developed. This was the most common factory jeep machine-gun mount during the war, with 31,653 produced. It was followed by the improved M31C in March 1945, but this came too late for much combat in World WarII. Besides these, units often created their own pedestal mounts in the field or adapted other pedestal mounts as available. Additionally, in 1943 the M48 bracket mount was standardized, to attach the .30-cal. machine gun or .30-cal. M1918 Browning Automatic Rifle in front of the passenger seat. Like with the pedestals, troops improvised many gun-holding brackets in the field. Troops frequently preferred a .30 cal machine gun on a pivot, to fire from the front passenger seat. Aside from actual fielding intentions, the jeep was widely used for various weapons mounts trials during World WarII, simply because the jeep was a handy platform to test all kinds of ring mounts, multiple gun mounts, as well as different weapons. The widespread adoption of the jeep in other armies also meant many different armaments. The most rigorous efforts were by the British. Perhaps the most well-known are the jeeps modified by the SAS for the 1942 desert raids in Egypt. These had several armaments, commonly using twin 0.303-inch Vickers K machine guns on the passenger side. These also served as a pattern for the later British airborne jeeps, armed with single Vickers K guns. Field kits Many field kits originated as locally made modifications and additions, for which standard kits were later produced by both the U.S. and Britain. Frequently used examples were rear baggage racks, ambulance litters and frames to transport lying wounded on jeeps, and wire cutters. Soldiers frequently ran into (literally)