Major Garth Charles Douglas Callender is the author of After the Blast: An Australian Officer in Iraq and Afghanistan, published by Black Inc.
in 2015.He rose to prominence when it was announced by the NSW Baird Government that he would spearhead the state's Veterans Employment Program.He is an Ambassador for Bravery Trust alongside Justin Langer AM, Kevin Sheedy AM and Dr Paul Alexander AO.In January 2017 he was named patron of the Matthew Millhouse Salute, a charity event in honour of Trooper Matthew Millhouse, who died on 28 August 2015 from Young Onset Dementia, caused by a traumatic brain injury received from a bomb explosion in Iraq in 2004 in which both he and Garth were injured.