Now there's an eye for detail!!
Green because of the 1 helmet rule. At least the Pack can adapt. Washington tried to be different by taking the stripes off their helmets for their throwback game on Nov 3 2013, but many other teams are out of luck...Tampa Bay cream cicle unis with the original helmet or the Patriots with 'Pat' the center, those looks are gone unless the rule gets updated or changed.
Aren't the facemasks removable? Are they welded on? Or just too much trouble to change?