New Zealand's military aviation began in 1913 when the New Zealand Army was presented with two Blériot monoplanes by the United Kingdom. These machines were grounded after a young woman was given a joyride; on the outbreak of hostilities, the Bleriots were sent to support British forces in Mesopotamia. In the Great War, New Zealand aircrew flew as part of the British Royal Flying Corps and Royal Naval Air Service. New Zealand pilots serving with British forces saw service in all theatres. Fifteen became aces, the top scorer being Keith Caldwell with, depending on how counted, more than 24 victories. The government assisted two private schools to train pilots for the conflict. The Walsh brothers flying school at Auckland was founded by Leo and Vivian Walsh—pioneers who had made the first controlled flight in New Zealand. From 1915 pilots trained on the Walsh Brothers Flying Boats including Curtiss machines, aircraft of their own design and, later in the war, the first two aircraft made by Boeing. In 1916 Sir Henry Wigram established the Canterbury Aviation Company at Sockburn, Christchurch, and purchased Caudron biplanes from Britain for pilot training. He gifted the aerodrome, later Wigram Aerodrome, to the government for defence purposes. At the end of the war many New Zealand pilots stayed with the new Royal Air Force and several had attained high rank by the outbreak of World War II. Others returned to New Zealand and, serving part-time, provided the nucleus of the NZPAF.
At the close of hostilities Great Britain offered each of the Dominions a hundred war-surplus combat aircraft. New Zealand was the last to respond and least enthusiastic. When the Avro 504s, Bristol F.2 Fighters and, De Havilland designed, Airco DH.4s and Airco DH.9s did reach New Zealand they were either placed in storage or loaned to the flying schools, barnstormers and nascent commercial operators. Several of the military aircraft were heavily modified—a 504 becoming a 3-seat floatplane and a DH-9 acquiring an enclosed passenger cabin. The importance of aviation in war was belatedly recognised, largely thanks to the efforts of visionary parliamentarian Sir Henry Wigram. In 1923 the New Zealand Permanent Air Force was formed: a part of the Army staffed by 72 pilots with Great War experience.[citation needed] It was initially equipped with the surviving Avro 504K, the DH.4s, DH.9s and Bristol Fighters. These operated from an airfield outside Christchurch at Sockburn. In 1926 Wigram donated £2,500 for the purchase of modern fighters and Gloster Grebes were acquired. Sockburn was later renamed Wigram, a name adopted by the suburb which grew up around the airbase.
A trickle of new-build Bristol Fighters and other new types joined the NZPAF in the late 1920s and early 1930s. A Lewis gun-equipped De Havilland Gipsy Moth floatplane took part in naval operations against rebels in Samoa. The NZPAF's first action came in 1930 when the Moth dropped an improvised bomb made out of a treacle tin on to a ship suspected of gun-running. The bomb did no damage, fortuitously, as the target turned out to be a local missionary vessel. More creditably, Fairey IIIFs made a dramatic maritime rescue and in the aftermath of the Napier earthquake the NZPAF flew in urgently needed supplies and medical equipment. Like other western air arms a major expansion began from the mid 1930s. The NZPAF acquired more modern British types including significant numbers of Airspeed Oxfords, Avro 626s, Fairey Gordons, Vickers Vildebeests and Blackburn Baffins—and small numbers of other types. The NZPAF was renamed the Royal New Zealand Air Force in 1934 and became an independent service in 1937.
At the outbreak of World War II the primary equipment of the RNZAF was 30 Vickers Wellington bombers, which the New Zealand government had offered to the United Kingdom, in August 1939, together with the crews to fly them. They became 75 Squadron. Many other New Zealanders were serving in the RAF. The primary role of the RNZAF was to take advantage of New Zealand's distance from the conflict by training aircrew, as part of the Empire Air Training Scheme, alongside the other major former British colonies, Canada, Australia and South Africa. For this task large numbers of De Havilland Tiger Moth, Airspeed Oxford and North American Harvard were manufactured or assembled locally and second-hand biplanes were acquired—such as Hawker Hinds and Vickers Vincents—as well as other types for specialised training such as Avro Ansons and Supermarine Walrus. Only when German surface raiders became active was it realised that a combat force would be needed in New Zealand in addition to the trainers.
The presence of German raiders lead to the formation of New Zealand-based combat units—initially rearming types, like the Vildebeest, and hurriedly converting impressed airliners, such as the DH86 to carry bombs. Lockheed Hudsons were obtained early in 1941 to take over this role. No. 5 Squadron with Vickers Vincents and Short Singapores were sent to protect Fiji. In December 1941 Japan attacked and rapidly conquered much of the area to the north of New Zealand. With the apparent threat of imminent invasion New Zealand was forced to look to her own defence, as well as to help the United Kingdom. Trainers and more airliners in New Zealand were camouflaged and armed and types, such as the such as the North American Harvard, Hawker Hind, Airspeed Oxford and even the de Havilland Tiger Moth, formed shadow bomber, army co-operation and fighter squadrons for use in the event of invasion. Hudsons moved forward into the South Pacific while No. 5 Squadron, in Fiji, commenced operations against the Japanese despite its obsolete equipment.
The vulnerability of New Zealand to Axis naval activity was demonstrated when a submarine-launched Japanese float plane overflew Wellington and Auckland—where it was chased ineffectually by a Tiger Moth. As few combat-capable aircraft were available at home and Britain was unable to help, New Zealand turned to the United States and signed a lend-lease agreement. Gradually at first, America was able to supply New Zealand with aircraft for use in the Pacific Theatre— initially, in 1942, Curtiss P-40 Kittyhawks and additional Harvards and Hudsons. The fall of Singapore led to the evacuated RNZAF pilots, in the RAF there, becoming available in New Zealand and they provided an experienced nucleus around which new fighter squadrons were formed. The early lend-lease aircraft were obsolescent and had difficulty holding their own against the skilled and well-equipped Japanese pilots, but as soon as pilots had converted to the lend-lease aircraft they were pressed into action. From mid-1943, at Guadalcanal, starting with No. 15 and No. 14 Squadrons, several Kittyhawk units fought with distinction. Several RNZAF pilots became aces against the Japanese, including Geoff Fisken, the Commonwealth's leading ace in the Pacific war. Other squadrons flew the elderly but effective Douglas Dauntless and, later, the modern Grumman Avenger torpedo bomber. From 12 October 1943, as part of Operation Cartwheel, RNZAF aircraft joined an allied air campaign against Japanese held airfields and the port of Rabaul.
The RNZAF took on a major part of the maritime reconnaissance task with Catalina (and later Sunderland) flying boats and Hudson bombers. The role of the RNZAF changed as the allies moved off the defensive. The Americans, leaders of the Allied nations in the Pacific, planned to bypass major Japanese strongholds, instead capturing a handful of island bases to provide a supply chain for an eventual attack on Japan itself. The Allied advance started from the South Pacific. The RNZAF was part of the force tasked with securing the line of advance by incapacitating bypassed Japanese strongholds, for example, Rabaul. As the war progressed the older types were replaced with more powerful modern aircraft; Kittyhawks gave way to Corsairs, Hudsons and Venturas. At the close of war the RNZAF was planning to bring 320 P51Ds into service as part replacement for the F4U. At its peak, in the Pacific, the RNZAF had 34 Squadrons—25 of which were based outside New Zealand and in action against Japanese forces. Thirteen squadrons of Corsairs, six of Venturas, two each of Catalinas and Avengers, two of Dakotas. The RNZAF also had a squadron of Dauntless dive bombers, several mixed transport and communications squadrons, a flight of Short Sunderlands and nearly 1000 training machines. To administer units in the South Pacific, No. 1 (Islands) Group RNZAF was formed on 10 March 1943.[5] In addition to this several hundred RNZAF personnel saw action with RAF squadrons or the FAA in Burma, Singapore and the South Pacific. By 1945 the RNZAF had over 41,000 personnel, including just over 10,000 aircrew who served with the RAF in Europe and Africa