Halo 4: The Return Chapter 1: The Dawn July 21st, 2557 (Military Calender) Unknown Space. Near the Forerunner Shield World of Requiem As the view moves through space as a shadowy object that what appears as a severed Aft section of a UNSC Frigate comes into view. As the camera zooms by the it shows that it's Aft section of the UNSC Forward Unto Dawn which was last seen in the ending of Halo 3. Inside Aft section's cryo bay Cortana appears on the holo-pedestal, she looks at calender. “Hmm, so it's been four years since the war ended.” she murmured to herself. “Chief!" she yelled.