A live field exercise will be held from October 25 to November 7 with six brigades fighting each other right in the heart of Norway.
The drill will involve 45,000 participants from over 30 nations, including 10,000 rolling or tracked vehicles, 150 aircraft, and 60 ships.
There are 700 US Marines stationed in Norway.
Normally, US carrier groups operate according to a standard seven-month cycle.
NATO is stockpiling weapons, military equipment, and ammunition in the Baltic region and Poland.