In some logistics systems, "YRC" is associated with freight or specific manufacturing codes.
This could be a specific Yearly Record Card or a clerical code used in personnel or maintenance archives. Search results for 6 yrc raf
"6 YRC" may be a specific shelf mark or reference number in a digital library like the . In some logistics systems, "YRC" is associated with
"No. 6 Squadron RAF history 1940s" (or your specific era) For technical info: "RAF YRC part specification" 6 Squadron? In some logistics systems