From the ABC https://www.abc.net.au/news/2021-07-30/adf-soldiers-to-arrive-in-sydney-covid19-lockdown/100336124 https://www.abc.net.au/news/2021-07-30/adf-soldi

From the ABC https://www.abc.net.au/news/2021-07-30/adf-soldiers-to-arrive-in-sydney-covid19-lockdown/100336124 https://www.abc.net.au/news/2021-07-30/adf-soldiers-to-arriv... , ADF is assisting police who are checking on those who are infected are actually staying home. Instead of 2 police knocking on your door, there is 1 police and 1 ADF. https://www.theguardian.com/world/2021/jul/07/what-happens-if-youre-diagnosed-with-covid-19-in-australia https://www.theguardian.com/world/2021/jul/07/what-happens-i... has some detail on what each state does. In Queensland if you get Covid you are taken to a hospital. (not in article:In other states the case numbers are much lower so people are sent to medical hotels to ride out the disease and make also sure they don't infect anyone else) In NSW there are 2500 cases so they don't have that luxury and rely on infected people actually staying home. Hence the need for random checks to make sure the sick people aren't out roaming.