The Beta-5 Division is a UNSC Office of Naval Intelligence Section Three subcell.[1] It is extremely secret, known by very few UNSC, or even ONI personnel for that matter.


It is charged with the SPARTAN-III Program and is also known for its extreme decryption facilities.[2]



The helmet used by Beta-5 security forces is a shared asset between branches of the UNSC military and has also been adopted as the MJOLNIR Military Police variant.[3]


Beta 5 Strike Teams often utilize the Bubble Shield.[4]


The Beta-5 Division Ordnance Testing Facility, a Beta-5 Division installation in the Swanbourne, Perth district of Western Australia, designed and tested S-variant[5] and R-variant[6] Mjolnir Powered Assault Armor,[3][7][8] as well as the Operator variant with Chalybs Defense Solutions.[9][9][note 1]






  1. According to the Armory in Halo: Reach, the Operator armor was developed at the Beta-5 Division Ordnance Testing Facility. According to Halo: The Essential Visual Guide, the armor was developed by Chalybs Defense Solutions and was tested at Chalybs' Testing Preserve. The article assumes that the two organizations jointly developed the armor.


  1. Halo: Ghosts of Onyx, page ??
  2. Halo: The Fall of Reach, page 55
  3. 3.0 3.1 Halo: Reach, Description: Military Police
  4. Halo: Reach - Bonus Item: Instruction Manual
  5. Halo: The Essential Visual Guide, page 165
  6. Halo: The Essential Visual Guide, page 152
  7. Halo Waypoint: MJOLNIR Project 2
  8. Halo 3, Mark VI Scout and Recon armor descriptions
  9. 9.0 9.1 Halo: The Essential Visual Guide, page 133