Columbia subject headings:
Air defenses--United States.
Astronautics, Military--United States.
Directed-energy weapons.
Nuclear warfare.
United States--Military policy.
Harvard subject headings:
Astronautics, Military--United States
Ballistic missile defenses--United States.
Nuclear warfare.
United States--Military policy.
Princeton subject headings:
Astronautics, Military--United States.
Ballistic missile defenses--United States.
Nuclear warfare.
United States--Military policy.