Columbia subject headings:
Air defenses--United States.
Infrared technology--United States.
Missile attack warning systems--United States.
Space surveillance--United States.
United States. Department of Defense--Appropriations and expenditures.
Harvard subject headings:
Air defenses--United States
Infrared technology--United States.
Missile attack warning systems--United States.
Space surveillance--United States.
United States. Department of Defense--Appropriations and expenditures.
Princeton subject headings: