BERLIN — Germany’s military can’t simply shoot drones in the country’s domestic airspace out of the sky — and much of the reason has to do with protections put in place to avoid a repeat of the country’s Nazi past. The German constitution, adopted in the shadow of World War II, explicitly prevents the military, or Bundeswehr, from taking a key role in the country’s internal security. That’s because those who drafted it were mindful of how German military power had been historically abused by