Black body suit
From Halopedia, the Halo wiki
This body suit is a black, form-fitting suit of polymer body armor. It is able to deflect small-caliber rounds.
The suit is equipped with cooling and heating units that masks the infrared signature of the wearer, as well as creating a comfortable environment. The helmet has encrypted communications gear and a heads-up display, along with thermal sensors and motion detectors. The whole suit is fully sealed and gas tight, making them wearable in vacuum for up to fifteen minutes when equipped with an oxygen tank.
Unfortunately, the suit's general complexity leads to complications. Over prolonged periods of time the suit will become very uncomfortable to wear, is difficult to repair in the field, and is often in need of repairs. The suit also limits the wearer's motion, as remarked by Spartan Kelly-087.
These suits saw extensive use during the 2520s. They were used by the Spartan-IIs in several missions before they received their MJOLNIR armor. One of these missions involved infiltrating an Insurrectionist base in the asteroid Eridanus Secundus in the Eridanus system.
In the Halo: Fall of Reach comic adaptation, the suits' helmets are modeled after those of the ODST armor. In Halo: The Fall of Reach - The Animated Series, the helmets are changed to a unique design while the bodysuits themselves are almost identical to the base techsuit of the GEN2 Mjolnir armor.
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