Welcome to Halo Answers. What would you like to know?

Do you mean it isn't appearing?

If it isn't then you may need to get more all of the skulls before it reappears, try checking the skulls section of the meta-game screen to see if you got them all.

If you mean you unlocked the helmet but when you play online it doesn't appear but the Mark 5 armor does then don't worry this is a common problem and it should appear in the next match.

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