Columbia subject headings:
Combined operations (Military science)--Forecasting.
United States--Armed Forces--Organization--Forecasting.
United States--Military policy--Forecasting.
United States--Military relations--Forecasting.
United States. Army--Organization--Forecasting.
Harvard subject headings:
Twenty-first century
United States--Armed Forces--Organization--Forecasting.
United States--Military policy--Forecasting.
United States--Military relations--Forecasting.
United States. Army--Organization--Forecasting.
Princeton subject headings:
Twenty-first century.
United States--Defenses.
United States--Military policy.