H-120 Forward Observer Module
From Halopedia, the Halo wiki
The H-120 Forward Operating Module was a model of close-support target designator used by the United Nations Space Command during the Human-Covenant War. The H-120 FOM would be superseded by the H-155, the H-165, and the H-295 FOM models. On July 27, 2552 the Rajtom Facility of Misriah Armory sent a memorandum to SWORD Base concerning a shipment of H-165 FOM, suggesting that operators study the weapon's operating manual to familiarize themselves with differences from the H-120 and H-155 models.
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