If you've noticed Black Hawk helicopters off Wanda today don't panic.
The Australian Defence Force is doing a number of training exercises around Sydney from May 19 to 22.
Its website said teams would ''conduct explosive ordnance disposal training at ANZ Stadium, on Sydney Harbour and at Sydney International Airport'' from Tuesday to Friday.
The training involves response teams assessing and disposing of simulated explosive devices during the day and night.
''People may notice the movement of vehicles and personnel in and around the training areas; however, they should not be alarmed if they observe these activities,'' the site said.
The training is being conducted to ensure the ADF maintains the highest level of capability and is prepared to support Australia’s national interests.''
The force consulted with authorities and aimed to minimise disruption to residents and businesses.
It thanked the community for its patience during the training.