It's clown world level to see any military using a consumer chat application for sensitive operations, especially one made by a foreign cooperaton. They really don't seem to take opsec seriously even when leaks have already cost lives.
They made very successful use of consumer-level tech to defeat military-grade tech, e.g. various uses of drones to deliver munitions, and GSM networks as beacons over enemy territory.
No wonder: given their constraints, they jump on every solution that can work right now, with near-zero effort. While using a foreign-controlled tech is usually frowned upon, the US is not the side from which they particularly need to hide. I would rather see them using Signal though.
