The additional 1,100 troops would bring the military close to 10,000 total deployed in support of the border mission.
The Air Force said it is also preparing to award a contract to convert the Boeing 747-8 into a presidential transport plane.
Chief of Space Operations Gen. Chance Saltzman said Tuesday the Space Force has lost almost 14% of its civilian workforce in recent months.
The Air Force conducts regular tests of its Minuteman III ICBMs, as it looks for ways to bring costs under control for the successor Sentinel missile.
