WO Field Service Cap
SirTophamHat
You are correct in that, throughout the history of wearing the FS cap Warrant Officers wore the Officers cap Badge, eagle and crown. However AP1358 (6th edition), of 2004, quotes the wearing of a WO Beret badge on the hat in lieu of the Officers version. Similarly, I had never seen a Gp Capt wearing a FS cap and had assumed it would be of normal Officer pattern if so worn. However, the same AP now quotes them as wearing the same pattern as an Air Officer albeit with the standard Officer beret badge attached.
dragon166