Columbia subject headings:
Great Britain. Army--History--20th century.
Great Britain. Army--Weapons systems--History--20th century.
Strategy--History--20th century.
Tactics--History--20th century.
Harvard subject headings:
Great Britain. Army--History--20th century.
Great Britain. Army--Weapons systems--History--20th century.
Strategy--History--20th century
Tactics--History--20th century.
Princeton subject headings:
Great Britain. Army--History--20th century.
Great Britain. Army--Weapons systems--History--20th century.
Strategy--History--20th century.
Tactics--History--20th century.