Boeing C-17 Globemaster III

Boeing C-17 Globemaster III entered RAF service in 2001 and quickly changed what British air power could move, how fast it could move it, and how far it could operate without outside help. Acquired for No. 99 Squadron at RAF Brize Norton after years of concern over Britain’s strategic lift gap, the large four-engined transport gave the RAF a dependable way to carry outsized vehicles, troops, helicopters, relief stores and medical teams direct to distant theatres. In practice, it became one of the central enablers of British expeditionary warfare and humanitarian response in the early twenty-first century.

A strategic airlifter for a new era

The C-17 originated in the United States Air Force's programme to combine strategic transport capacity with access to shorter, less-developed airfields. Built initially by McDonnell Douglas, the aircraft made its first flight on 15 September 1991 and began entering USAF service in 1993. Boeing subsequently inherited the programme following its merger with McDonnell Douglas.

In May 2000, the British Government announced an initial lease of four C-17As to address a shortage of heavy strategic airlift. The RAF received its first aircraft, ZZ171, on 17 May 2001, and formally accepted the type into service with No. 99 Squadron on 23 May. Britain became the first international operator. The original leased aircraft were subsequently purchased, and additional deliveries increased the fleet to eight by May 2012.

The attraction lay in flexibility. The aircraft could carry loads far beyond the practical reach of older tactical transports such as the Lockheed C-130 Hercules, yet it did not require the infrastructure associated with the biggest purely strategic freighters. That balance mattered in an era when British operations were increasingly global, politically time-sensitive and often dependent on moving heavy equipment quickly. Later, as the Airbus A400M Atlas entered service, the C-17 remained the heavier long-range partner rather than a redundant predecessor.

From Afghanistan to worldwide crisis response

The C-17 entered RAF service shortly before the attacks of 11 September 2001 and soon became central to Britain's expeditionary operations. No. 99 Squadron supported deployments to Afghanistan and Iraq, carrying personnel, vehicles, equipment and essential supplies over intercontinental distances. Its ability to accommodate outsized cargo reduced reliance on chartered aircraft and allowed the RAF to deliver heavy loads directly into operational theatres.

The aircraft also proved valuable during humanitarian emergencies and evacuations. In December 2013, an RAF C-17 evacuated British nationals and others from Juba in South Sudan despite a damaged civilian aircraft obstructing part of the runway. During the Kabul evacuation in August 2021, Operation Pitting, RAF C-17s played a major role in the airlift of more than 15,000 people. One aircraft carried 439 evacuees on a single flight, a record for an RAF Globemaster.

The type subsequently supported humanitarian and military operations worldwide, including the evacuation from Sudan in April 2023 and the movement of equipment and supplies in support of Ukraine. It has also carried helicopters, armoured vehicles and medical evacuation teams, illustrating the range of missions possible with a single heavy transport fleet.

Heavy airlift and RAF capability

The C-17's contribution to the RAF rests on its combination of long-range performance, substantial payload capacity and access to relatively short or austere runways. Its rear loading ramp, high-lift wing and robust landing gear allow heavy vehicles, helicopters and palletised freight to be moved with fewer intermediate handling stages.

The aircraft also supports aeromedical evacuation and urgent humanitarian operations. No. 99 Squadron operates the fleet from RAF Brize Norton, while No. XXIV Squadron provides air mobility conversion training.

Twenty-five years after its introduction, the RAF continued to operate eight C-17As alongside the Airbus A400M Atlas and Voyager fleets. The Globemaster remained Britain's principal heavy strategic airlifter, providing a capability essential to overseas deployments, crisis response and the movement of large military equipment.