They are two of Jun's helmet. One is for your avatar and the other is for your Spartan on Halo: Reach.
The one for your avatar is simply got for "Killed 100 enemies in a row without dying in either Campaign or Firefight.
The one for your spartan I'm not sure about.
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Jun's colour is sage its above forest green, preety much the same as john 117 (master chief.)
helmit
Depending on exactly what you mean there are two answers. If you mean a helmet as a hat for you character: go to my Roblox, then character. From here find the helmet in your hats and click wear. If you mean wear a helmet you found in game: Touching the helmet should put it on automatically.
It is very rare but I think you can get it by doing the following: In the catalogue for the costume trunk, go to the viking section where there is a girl penguin wearing a viking helmet. Click the helmet on the word 'viking'. Get the red helmet. Press the 'x', click the same helmet again, close it, click the helmet again, close it then click it again but don't press the 'x'. This time press the helmet on the girl penguin's head.
It is actually called something else that I can't remember, but you unlock it in the E.V.A. helmet as an accessory after you buy every other helmet and accessory.