Military intelligence 121 History 33 World War, 1939-1945 29 Intelligence service 19 Army 12 Secret service 12 Drill and tactics 10 Urban warfare 10 Congresses 6 Biography 5 Campaigns 5 Military history, Modern 5 National security 5 World war, 1939-1945 5 Cryptography 4 Electronic intelligence 4 Espionage 4 Handbooks, manuals, etc 4 Command and control systems 3 Deception 3 Electronic surveillance 3 Intelligence Service 3 Intelligence officers 3 Personal narratives, American 3 Strategy 3 Study and teaching 3 Australia 2 Cold War 2 Communications, Military 2 Deception (Military science) 2