According to "The Empire's Waggoners"
"On the outbreak of the Second World War, the civilian status of NAAFI personnel caused problems when serving with the forces overseas. This was overcome by forming Expeditionary Force Institutes in which male NAAFI personnel were enlisted into the RASC, wearing RASC uniforms with EFI titles (figure 2406 - "EFC" embroidered in black on khaki slip on). Female NAAFI members were similarly enlisted into the "ATS" and those serving on board naval ships were enlisted into the RNVR".
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