From Halopedia, the Halo wiki
The video takes the form of File:CHELAN_20200714, a file part of Director Schaefer's "content series" in ONI Section 2's public awareness campaign regarding the UNSC's role in colonial security. The series is aimed at educating UEG citizens on the history, evolution, and application of the Spartan Program.
ONI Screen activates, showing the file name "File:CHELAN_20200714", and a wave form of a "Comms Officer". With the words "Transmission suspended" in the center of the screen.
Audible sounds play suggesting the comms officer looking at whatever Andres is showing
ONI Screen deactivates, and the Halo 3 logo appears saying "Available now" below it.