Green Visor?

How do I obtain it? I have seen a few people with it. Is it a specialization visor or what?

Complete Splatter Mastery.

The Verdant visor is unlocked by obtaining the master commendation in Splatters.
Edit: ^Dang, I was beaten to the punch.

1). Splatter 165 people
2). Profit

Dat Verdant. <3