Now includes Halo 4 :D
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GUNGIR and JFO are actually my favorites with the exception of EVA [C]. GUNGIR is nice because it's different. Most of the helmets look the same, however the GUNGIR can be spotted a mile away. JFO looks awesome when used with the black visor. The visor has little details that make it look like the face of Ironman when using the black visor. Ugliest? I'd say the non-default EOD.