Spartans with Marine experience prefer NIGHTFALL armor when stationed on inhospitable worlds, due to its best-of-class life support.
- The Nightfall Helmet is unlocked when you watch the fourth episode of Halo: Nightfall, whereas the full armor is obtained when you watch all five episodes.
- ONI symbols appear on the armor in multiple places, most notably on the helmet on the sides of the Visor and on the chest piece
- Fingerprint smudges appear on the helmet near the left and right edges of the Visor
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