Set Photos from 21 JUMP STREET with Channing Tatum and Jonah Hill

Here's your first look at Channing Tatum and Jonah Hill in uniform and on the set of the feature film adaptation of 21 Jump Street. The film is being directed by To be directed by Phil Lord and Christopher Miller (Cloudy with a Chance of Meatballs), and it also stars Ice Cube, Brie Larson, Rob Riggle, DeRay Davis, Dave Franco and Jake Johnson. It was also confirmed that Johnny Depp will make a cameo in the film as well.

The story centers on two undercover cops played by Hill and Tatum, who are assigned to work in high school. The movie is currently shooting in New Orleans 

My question is... why do people still flash the peace sign in photos?