Beards don’t work well with oxygen masks on aircraft either and you try to done a sweep-on mask over a turbine you may just end up with a face full of turbine instead.
The Delta guys and some of the Special Operations Units often have to deploy on extremely short notice and the mission may call for "blending in" and its hard to grow long hair or a beard on short notice. Just my .02 worth:smile:I have a nephew who is a Airborne Ranger. He trained for Delta. He said they were all old guys (40 would be old to him) with beards. He didn't make it. They told him to come back in about 5 years.
I can see special forces blending in with the locals but not state side.