In November 2001, engineers and researchers from the US Air Force Research Laboratory, in Arizona, the Defence and Civil Institute for Environmental Medicine in Toronto, Canada, and from the UK Ministry of Defence, Defence Science and Technology Laboratory and QinetiQ Ltd, in Bedford, UK conducted a coalition, Distributed Mission Training (DMT) research event. This international exercise supported development of alternative implementations and applications of DMT by the cooperating, partner nations. The UK approach focuses on mission planning and coordination with only one mission engagement per day supported by a team of subject matter experts. The US has focused on tactical execution by providing a large number of limited engagements with few supporting personnel required. In the US, training events are conducted at individual operational units, which now have four-ship mission training centers. The majority of training activities are conducted at these mission training centers with emphasis on four vs many, beyond visual range air-to-air engagements. The US - Canada - UK coalition DMT exercise was based on two previous, RAF combined air operation exercises that focused on training coordinated actions of air-to-air, air-to-surface, and command and control entities. The differences between US and UK implementation and application of DMT provide an ideal opportunity to examine alternative approaches for using similar training technology to fulfill different training objectives and current training methodology.