User blog comment:Legionwrex/Spectre vs Spartan II/@comment-109.240.180.71-20110107101641/@comment-217683-20110107102236

You're thinking of Covenant stealth technology, I think. The camouflage a UNSC trooper (like a SPARTAN-II) would have really isn't that great. It's nowhere near as good as the Tactical Cloak, which a Spectre would likely have access to.