The head of German arms giant Rheinmetall is refusing to be intimidated despite round-the-clock security due to a litany of threats to his safety. On Sunday, Armin Papperger said “chickening out” was not an option in his field. “These jobs must be done and anyone that can’t take the pressure doesn’t belong in this job,” Papperger said. The 63-year-old is under police protection due to alleged Russian murder plots and has bodyguards at his side at all times, even in Rheinmetall’s Dusseldorf...