Exchange officer

An exchange officer is a commissioned officer in a country's armed forces who is temporarily to a unit of the armed forces of another country.

Exchange officers usually serve in similar roles to those that their career path would take them were they to remain in the armed forces of their home state. The exchange officer will usually perform all duties as if he or she were actually in the armed forces to which they are attached. This includes going to war, if required, although this would require that permission be granted from their home government, and that other conditions may be attached. The stated purpose of an exchange officer programme is usually to help foster understanding of each other's operating methods. This provides valuable feedback so that any issues that crop up in joint operations, such as those done under NATO, would not impede the achievement of mission objectives.

The British and the U.S. armed services have many exchange officers; for example, a British officer has been attached to the United States Military Academy at West Point for many years. The Australian Army also attaches one of its officers with the rank of captain to the Royal Military College of Malaysia. Though the Canadian government was stated to be neutral with regards to the Iraq War, many Canadians fought in Iraq under exchange with the U.S. military.

...
Wikipedia