In real life they are accountants, bankers and business executives. Some have already reached retirement age. Today, these tourists from Hong Kong are pretending to be Israeli army commandos, specialists in counterterrorism.

As their Rambo-like trainer barks out orders, they move their assault rifles into position and, using the Hebrew word for fire, repeat after him: “Esh. Esh.”

“Louder,” he demands. “I can’t hear you guys. Don’t be so politically correct.”