existence Rhodesia maintained a small professional standing army of 3,400 troops, about a third of whom were black volunteers. In the tradition of many colonial armies, it was primarily organised into light infantry battalions trained and equipped for counter-insurgency warfare or internal security actions, and possessed little artillery or armour. The Royal Rhodesian Air Force (RRAF) had 1,000 personnel and six squadrons of aircraft, including forty to fifty Hawker Hunter and de Havilland Vampire strike aircraft and English Electric Canberra light bombers. It also possessed a helicopter squadron, a transport squadron, and a light reconnaissance squadron. The Rhodesian military was backed by the British South Africa Police (BSAP), a well-equipped police force whose title was derived from the law enforcement division of the British South Africa Company. The BSAP had armoured vehicles of its own and a potent paramilitary capability. Domestic and external intelligence gathering were vested in the Central Intelligence Organisation (CIO). As a result of the escalating rural insurgency, the Rhodesian Security Forces began to depend more heavily on white conscripts and reservists of the Territorial Force and Territorial reserves. Regular units remained small throughout the Rhodesian Bush War but became increasingly specialised and were often able to have an effect utterly disproportionate to their size. The security forces included a disproportionate number of personnel who had seen action during the First Malayan Emergency as well as the Aden Emergency, and their experience gave Rhodesia's defence establishment a solid grounding in counter-insurgency warfare and small unit tactics in particular. Nevertheless, the vastness of the operational area and Rhodesia's limited manpower pool left the army, air force, and BSAP constantly overstretched. Budgetary and resource restraints, coupled with manpower shortages, meant the security forces could not expand quickly enough to match the guerrilla movements, and were almost always outnumbered. Rhodesian units compensated for their disadvantage in this regard by pursuing an aggressive preemptive and counterstrike strategy, raiding neighbouring states to destroy guerrilla forces in their external sanctuaries. All white, male residents aged eighteen to twenty-three were obligated to fulfill four and a half months (later extended to nine months) of full-time national service. This was followed by a three-year reservist obligation. By 1974 the national service intakes had been doubled, and white men over twenty-three were also conscripted. In 1978 the Rhodesian Army had about 14,000 white national servicemen, but continued manpower shortages forced it to recruit black volunteers in