Sixteen UN nations supplied fighting units and five sent military hospitals and field ambulances. Australia was one of the very first to contribute military personnel from all three services. The single largest UN contributor was the United States of America (USA) which at one stage had 140,000 personnel deployed in direct combat roles in Korea. Great Britain, Canada, France, Belgium, the Netherlands, Colombia, Ethiopia, South Africa, New Zealand, Turkey, Greece, Thailand, Philippines and Luxembourg sent fighting units. Norway, Sweden, Denmark, India, Italy contributed military hospitals and field ambulances to the cause.