Operation Buffalo took place in 1956. "I'm Counting On You", the song heard in the opening scene, was first released in 1961 (wr. Alicia Evelyn, recorded by Johnny Nash then more famously by Johnny O'Keefe). Perhaps they mixed it up with the 1956 Elvis Presley song of the same title, a different song (wr. Don Robertson).
Can you spot the camera drone in the sky? You will if you watch Leo Carmichael and Bernie in the scene at Maralinga Airstrip.