Halo: MCC Is Adding An Unreleased Halo: Reach Helmet And Armor

The GRD helmet is finally coming to Halo: Reach within The Master Chief Collection.
The Master Chief Collection brings together four Halo games into one collection for the Xbox One.

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The circled reach helmets are the ones that haven't been added to

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Halo: MCC Is Adding An Unreleased Halo: Reach Helmet And Armor

Mariner (helmet) - Armor - Halopedia, the Halo wiki

I appreciate how clean the Halo 3 armor sets look in MCC. : r/halo