The SPARTAN-II Class II Program (also called Project OLYMPIAN or Olympian Detachment) was the second generation of the highly-successful SPARTAN-II Program, designed to produce genetically and cybernetically enhanced Spartan-grade supersoldiers for the UNSC. Despite the official records that Dr. Halsey's second generation to the program was never activated, the Office of Naval Intelligence did in fact initiate the program a year after Halsey's request was denied. In 2537, 150 candidates were identified and captured by agents, then moved to the planet of , where they began training under Cassandra-075 and several other trainers.