Can you help identify?

Photo 77

W_HAMMERTON_9.jpg
1940. Puckapunyal army base, Seymour, Victoria. Back row second from left VX15400 Lieutenant Jack Walters, extreme right VX15366 Frederick Crick. Photo courtesy of W. Hammerton (daughter of VX15400 WALTERS, JACK HUGHES). id no. W_HAMMERTON_9