In the 60's having a tour of the BMEWS site at Thule - the most modern in the chain. At 'J' site on the hill way above the airfield. Four gigantic fixed arrays standing on edge, each the size of a football field, a dome containing a 150 ton scanner which could move at 32degrees/sec and stop deadbeat. Miles of interconnecting tunnels with underground roadways and waveguides each about 3ft by 18 inches in size running along the roof. Gigantic magnetrons and switching components the size of a small shed. All incredibly impressive. At the end of the tour the guide asks for questions. Silence from the course. Embarrassed silence. Then one of the DS saves us - 'What time does the BX shut?'