⧫ Wartime Defenses - 20th

Acoustic Locators & Sound Mirrors ..

Air-raid shelters ..

Air Raid Sirens ..

Analog & Digital Computing ↠ 

ARP - shelters ..
Atlantikwall ..
Atlantikwall - Channel Islands ..

Atomic Energy Authority, '54 ↠  

Barrage Balloons ..

Beach Defences ..

Black Submarines ..

1940-5 - Britain Opts to Fight On .. 

Britain's Early Defences - WW2 ..

British aerospace industry ..

Bunkers .. 

Cardington - airships, barrage balloons .. 

Coastal Defence ..

CoG - Continuity of Government ..

Communications - Battlefield .. 
Communications: Underwater Cables ..

1946-9-24 Containment as US Policy ..

Daylight Saving Time ↬

D-Day Innovations ..
Defence, Emergency, Medical, Rescue ..
Defences - structural ..
Defence of the Reich - Reichsverteidigung ..

Defending Against Sealion ..

Destroyers - Evolution ↠

Detecting Submarines ..

Drang nach Osten & Lebensraum ..

Field Fortifications - Defense in Depth ..

Firefighting History ..

Fort Drum, Manila Bay ..

French Resistance - la Résistance .. 

German Defences ..
Global Military Spending Increasing ..

Hawk versus Dove .. 
Hindenburg/Siegfried Line WW1 ..
Infrastructure: Polyethylene, radar, and submarine cables ..

Lanchester's Laws .. 

LDV ..
Linguists & Y Stations ..

Maginot Line .. 

Maths of War ↠

MIC - Military Industrial Complex ..

MILDEC - Military deception ..

National Defense Systems ..

Night Fighters ..

NORAD ..

Observer Corps - ROC ..
Ostwall .. 

PO telephone system ..

Power of Geography ..

RAF bases ..   

Red Sand Sea Towers ..         

Rescue at sea ..

Safety Glass ..

Semiconductor Tensions, Telecommunication Networks ↠

Siegfried Line (1939) - Germany's Western Defences ..

Spies for Peace - Cold War ..

Survival at Sea ..

Torpedo Defense Systems ..  

WEFT - ROC aircraft identification ..

V1 Flying Bombs .. 

Cold War 1

1957 Defence White Paper ..