This article is about the folder called S-III. Were you looking for SPARTAN-III Program?

S-III was a folder on Colonel James Ackerson's computer at CASTLE Base on Reach. When Dr. Halsey hacked the computer, she discovered two folders, S-III and KING UNDER THE MOUNTAIN.[1][2]


Contained in the S-III folder was a file called "CPOMZ," which contained star charts. Halsey used the CPOMZ star chart to locate the SPARTAN-IIIs and the planet Onyx.[3] The letters CPOMZ are also an acronym for: Chief Petty Officer Mendez (CPOMZ), the man who trained the SPARTAN-IIs at a young age. This lead Halsey to believe that Chief Petty Officer Mendez was somehow mixed up with Ackerson.


In the folder were also extensive records of the SPARTAN-II Program and its members. This indicated that Ackerson had knowledge of and an interest in the supposed top secret SPARTAN-II program.[4]


  1. Halo: First Strike, page 128: "Kalmiya, please retrieve the data file and show me the contents of Colonel Ackerson's directory."
  2. Halo: First Strike, page 129: The folders and files winked away, and only two folders remained floating over Dr. Halsey's desk: S-III and KING UNDER THE MOUNTAIN.
  3. Halo: First Strike, page 130: "There was one last file in the S-III folder. As Dr. Halsey tapped it open, Kalmiya said, "That is only a fragment. It had been erased, but I managed to reconstruct it from trace ionization in the memory crystal." Dr. Halsey examined its contents. There was only CPOMZ followed by a 512-character alphanumeric string. "This longer portion is a star chart reference," she whispered."
  4. Halo: First Strike, page 129: "She tapped on the first one and it opened, revealing hundreds of separate files. Dr. Halsey examined them--there were medical files on each of her Spartans: complete records from their preindoctrinated origins; their childhood vaccinations; their parents; their extensive injuries and treatments during their training; even the experimental procedures used to enhance their strength, agility, and mental resiliency."