Columbia subject headings:
Harvard subject headings:
Armed Forces--History--20th century.
Armed Forces--History--21st century.
Civil-military relations--History--20th century.
Civil-military relations--History--21st century.
Military art and science--History--20th century
Military art and science--History--21st century
Military art and science--Technological innovations--History--20th century.
Military art and science--Technological innovations--History--21st century.
Sociology, Military--History--20th century.
Sociology, Military--History--21st century.
Princeton subject headings:
Military art and science--History.