Straight quote from the Hills Police Area command's FB page followed by a photo of an NH90, was posted yesterday afternoon, guess it could be related.
The Australian Defence Force will conduct counter-terrorism training across NSW in October and November, 2021. A pair of Australian Army helicopters has been training over the Hills this afternoon.
The training will take place during the day and night and will involve responses to simulated terrorist scenarios.
"People who see the training should not be concerned that any of the locations are under any form of actual threat."