R.a.o.c. Shoulder title – dating

R.A.O.C. shoulder title embroidered (blue letters on red cloth). Disregard yellow thread used to attach it to an embroidery item! (Printed version used in 1943, embroidered either at the same tame or later).
Questions:
1. Is it WW II?
2. Was it used before WW II?
3. Was it used later or probably still in use?
Thanks for being kind to answer.

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