Columbia subject headings:
United States--Armed Forces--Procurement.
United States--Armed Forces--Weapons systems--History--Chronology.
Weapons systems--United States--History.
Harvard subject headings:
United States--Armed Forces--Procurement--History.
United States--Armed Forces--Supplies and stores--History.
United States--Armed Forces--Weapons systems--History.
Princeton subject headings:
United States--Armed Forces--Procurement--History.
United States--Armed Forces--Supplies and stores--History.
United States--Armed Forces--Weapons systems--History.