The decal shown in the first post seems to be added to all the helmets automatically like this:
If you want to remove it on your livery, add this line:
{"pilot_AV8B_helmet", DECAL ,"empty",true};
Two fictional liveries loosely based on the Royal Norwegian Air Force Saab Safari trainers.
Download here: https://www.digitalcombatsimulator.com/en/files/3303171/
I use a color picker tool to get the html color code (e.g #ffffff) and paste it into Photoshop.
Unless you mean something else by "loading them into PS"?