The Indo-Pacific Centre’s Health Security Corps deployed two Australian volunteers to work with the United Nations (UN) World Health Organization (WHO) in Cambodia as part of Australian Government’s Health Security Initiativefor the Indo-Pacific Region. Stephanie Wheeler worked as a Technical Officer (Health Security) and Yasmin Lisson worked as the Epidemiology Officer between July 2017 and July 2018, as part of the Australian Volunteers Program, an Australian Government initiative and a key component of Australia’s aid program. Here, they talk about the challenges and achievements of their assignments, but also how, above all else, public health is delivered with a true commitment to leaving no-one behind.