Donald Trump has promised to create a Space Force National Guard if elected president.
The Republican nominee told the National Guard Association of the United States in Detroit that a reserve force is critical for defense in outer space.
Fears of Russia developing nuclear weapons to use specifically in space have ramped up in recent months.
Space is also becoming a vital area of national security as adversaries develop their celestial military capabilities.
Trump set up Space Force in December 2019 to form the first new branch of the military since 1947, when the Air Force became its own entity.