Columbia subject headings:
Chronologies.
Japan--Defenses--History--20th century--Chronology.
Japan--Defenses--History--21st century--Chronology.
Japan--Defenses--History.
National security--Japan--History--20th century--Chronology.
National security--Japan--History--21st century--Chronology.
National security--Japan--History.
Harvard subject headings:
Japan--Defenses--History.
National security--Japan--History.
Princeton subject headings:
Japan--Defenses--History.
National security--Japan--History.