Kingdom of Iraq garrison caps

[2xvetran]

I am hoping someone out there may know a bit more about these than me. I have two Iraqi Kingdom era garrison caps pictured here. The one with the green piping is made of wool with a dark blue lining and absolutely no marks of any kind. The one with the red piping is quite similar in construction but is done in a gabardine with a lighter blue lining and no markings of any kind. The badge is for a Kingdom guards unit. I am curious about the different piping, is it officer/enlisted? Or does it denote a specific branch? Thanks for any info or speculation. Scott:cheers: .