The Australian Defence Department's own export compliance checklist refers Australian organisations to the above US government entity list.

An Australian Defence Department spokesman said it "won't be providing comment" on the military surveillance system.

Whistleblowers interviewed by Four Corners also allege the Australian defence department's classified email and restricted networks have been hacked.

An Australian soldier from the NATO-led force was killed by a roadside bomb in the south on Saturday, the Australian Defence Department said.

The Australian Defence Department said the three men were missing for three days after their seven-meter vessel sailed off course and ran out of fuel.