The United Nations Space Command has roots dating all the way back to the end of the Second World War and the formation of the United Nations in 1946. It was first set up in 2164 when the Shikengi-Fukushima slip-space drive, which allowed travek over distances that would have taken years to get to in a matter of days, was invented.
They helped secure hundreds of planets which they later colonised and made suitable for normal human life at that time. They helped to keep then peace among all of the 800 planets under the control of the United Earth Government at the height of Human acheivement before the arrival of the Covenant.
Like any working miltary in history, the UNSC Defense Force has a multitude of different ranks, each rank depending on which section of the military you join or are drafted into.
|Private First Class|
Master Sergeant/First Sergeant
|Master Gunnery Sergeant/ Sergeant Major|
|Sergeant Major of the Marine Corps|