An often forgotten piece of Narellan's military heritage is the Narellan Military Camp. It lasted for around seven years during and after the Second World War. Thousands of troops passed through it on their way to somewhere else as the lives of these young men, and some young women, were changed forever. The camp was part of the defence arrangements for the eastern part of Australia. There were many military camps in the Sydney area, as well as a range of defence installations for the navy and air force. There were several camps and training areas used by the military and Narellan was only one of them. Other included Ingleburn, Liverpool, Wallgrove, and elsewhere.