Following a pair of deadly shootings by U.S. Immigration and Customs Enforcement officers, the division of the agency responsible for street arrests and deportations issued a new policy mandating a dress code for field operations.

The nationwide policy, shared with The Intercept by a Department of Homeland Security whistleblower and confirmed by multiple ICE officers, details a new set of appearance standards aimed at making it easier for the public and fellow law enforcement officials to recognize ICE officers in the field.

“Law enforcement officers performing field operations shall wear readily identifiable ICE attire, including a ballistic vest during high-visibility operations,” says a guidance memo signed by Acting ICE Director David Venturella. “Appropriate field attire includes khaki or coyote brown tactical type pants, paired with an ICE polo, or dark blue or black polo.”

The memo adds, “Clothing such as jeans, sweatshirts, hoodies, non-collared shirts, or apparel displaying graphics or screen prints is not authorized during field operations.”