The emblem seems to be Glider Pilots, but I'm not sure about the piping. There were no enlisted men who were warrant officers, so I don't know what their caps were like. Check here to see if that's any help. Branch colors - cap piping color reference - HEADGEAR [REF] Cap, Garrison, OD -- wool serge, US Army Air Corps piping. Maybe this? http://olive-drab.com/od_soldiers_clothing_combat_ww2_hats_garrison.php
Infantry/Airborne infantry- Blue piping Parachute with Glider pointing left - Enlisted A parachute with the glider pointing right would be Warrant Officer/Officer as they would wear their rank insignia on the left side. Thus, the glider will always be pointing to the front of the wearer. Unit would be an airborne infantry/glider/airborne artillery unit as signified by the parachute/glider/red circle receptively. But, you can nix airborne artillery, as their overseas cap would have red piping.
Glider riders had their own patch. Parachute units had these. This patch was for all airborne infantry by 1944, whether they be parachute or glider riders. Never seen this arrangement before. Here's some more variations. I can only guess that the red indicated artillery. More variations. And more. Obviously there were many unofficial patches made back then. Hope that this clears up things a bit!
Looks like all the patches with a blue background have the same piping. Very similar to what I posted in post #3.
Meh...I know my websites. Everything can be found in more detail on Mark Bando's Trigger Time 101st Airborne WW2 website: TRIGGER TIME - 101st Airborne WW2 Specifically, this page: Insignia