It's expected for military operations to fly without transponder, they don't want to have their location visible. But it's crazy that they're also doing it in Curacao controlled airspace without agreeing a restricted area.
Even for training they set up restricted/military areas in airspace all the time. Not doing it here, in allied (Curacao is part of the kingdom of the Netherlands) airspace is unacceptable. They could have coordinated this in the normal ways so ATC would route civilian traffic around the military operations or talk to the military controllers (who can see both types of traffic) before sending an aircraft through the shared airspace.
This isn't new, it's how military operations are done all the time.
Even for training they set up restricted/military areas in airspace all the time. Not doing it here, in allied (Curacao is part of the kingdom of the Netherlands) airspace is unacceptable. They could have coordinated this in the normal ways so ATC would route civilian traffic around the military operations or talk to the military controllers (who can see both types of traffic) before sending an aircraft through the shared airspace.
This isn't new, it's how military operations are done all the time.