David Johnston

David Johnston is not mentioned in either of the provided news articles. The articles focus on Australian defense matters, specifically Prime Minister Anthony Albanese's call for US and Iran negotiations regarding the Strait of Hormuz, and the appointment of Lt Gen Susan Coyle as the first woman to lead the Australian army. One article quotes the Defence chief saying Australian ships are ready and capable. The other details Susan Coyle's background as chief of joint capabilities, responsible for cyber and space commands, as well as information warfare, since 2024. Therefore, without further information, it's impossible to provide any details about David Johnston's background, newsworthiness, recent events, or relevance based on the given context.