5th Army Helmet Liner with insignia

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https://s1188.photobucket.com/albums/z414/mikbex/?action=view&current=USHelmetLiner5thArmy.jpg#!oZZ1QQcurrentZZhttp%3A%2F%2Fs1188.photobucket.com%2Falbums%2Fz414%2Fmikbex%2F%3Faction%3Dview%26current%3DUSHelmetLiner5thArmy.jpg

Hi
I acquired this liner, a Westinghouse Capac dated 1953, which was in a poor condition and painted green. It needed a complete overhaul, the webbing was rotted so I decided to bring it to its former glory by getting the shoddy paint off and replacing the webbing suspension. When I started to get the paint off, I discovered the liner was painted blue beneath and had the emblem of 5th Army on the right side, and crossed rifles with the nuber 3 above and the letters TRB beneath. This made the liner more interesting, I am unsure what TRB means, in the British Army, TRB means Theatre Reserve Battalion. Could anyone shed some light on the colour/insignia. Many thanks.