- Screecherz
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- Intrepid Mythic Member
The Spartans aren't given VISR capabilities because of a couple reasons, including both story necessity, and game capabilities.
First off, at the time that Halo 3 was in development, creating a VISR mode for a Spartan would have been a near-impossible feat. The resources to create it weren't available, and given their schedule, it would have been too large of a time allocation.
Secondly, Spartans have never really been introduced to very dark nighttime settings. Halo 1, 2, and 3 all had some dark parts throughout the Campaign, but everything was easy to see.