Exercise Reforger
Exercise Campaign Reforger ("REturn of FORces to GERmany") was an annual military exercise and campaign conducted by NATO during the Cold War. The exercise was intended to ensure that NATO had the ability to quickly deploy forces to West Germany in the event of a conflict with the Warsaw Pact. Although most troops deployed were from the United States, the operation also involved a substantial number of troops from other NATO countries including Canada and the United Kingdom.
The last Reforger exercise was Reforger 93. Exercise Steadfast Defender is the most similar military exercise that has taken place in the 21st century, also involving North American troops deploying across the Atlantic Ocean to exercise with European NATO allies. There is also the biennial Exercise Bright Star that involves operations in the Middle East. However, while NATO members (and other countries friendly to Egypt and the US) are free to participate, Exercise Bright Star is not a NATO exercise.