Duncan Blake transferred from the permanent Air Force to the Reserves in January 2017, after 22 years as a Legal Officer in the Royal Australian Air Force. He worked at the tactical, operational and strategic levels at home and on deployment overseas.

Duncan recently returned from the Middle East where he was providing legal support to aerial targeting operations in Iraq and Syria. He has worked with strike and fighter jet forces and units responsible for airspace surveillance. He has also been a prosecutor for the military.