Viewed from above, the fields surrounding Büchel air base stretch out like a greenish-brown patchwork quilt, punctuated by the small villages and woodlands that make up the Eifel region in western Germany. Take a closer look at satellite imagery, and you can make out several dozen camouflaged airplane hangars. Hidden deep below them lies a carefully guarded secret: underground vaults housing American nuclear bombs that date back to the Cold War. […] In March 2010, Germany’s parliament, the Bundestag, passed a cross-party resolution urging the government to “emphatically” work towards getting its American allies to withdraw all nuclear weapons from...