1988年2月19日，德国北莱茵河西华里亚（西德），从盖伦基兴空军基地起飞的北约E-3A“望楼”预警机在暮色中执行训练任务。北约组织共拥有18架 E-3A，1982年1月首架入役，自从规定所有航空器都要有注册国之后，北约这18架E-3A都注册在卢森堡这个没有空军编制的国家。（A NATO E-3A Sentry airborne warning and control system aircraft from NATO Air Base Geilenkirchen, West Germany, operates in the late evening skies durigng a training mission. The plane is one of eighteen such aircraft providing surveillance for member nations as directed by NATO's Airborne Early Warning Force commander.）