After a lawsuit, NYPD policy has changed where officers can now wear full turbans according to CNN. NYPD Commissioner states:

“We want to make the NYPD as diverse as possible, and I think this is going to go a long way to help us with that”

Sikh officers were allowed to wear small wraps before and a beard to a millimeter in length. That has changed to a full turban and grow up to ahlf an inch long beard. There are about 150 Sikh officers according to the NYPD commissioner.