hello this has been an issue since the new war came out but on the drifter the colours for headband on the hairstyles that have them can not be changed the colours that i have mine are a carry over form the operator. also on the operator the headband colours can be changed in Features > Marking which is something the drifter doesn't have.
Drifter
https://imgur.com/7yc7hRK
Operator
https://imgur.com/IwrZALg