About 18 months ago I posted a question regarding the 'Unit Code' X21 on my late father's Coldstream Guards Service Record. He was posted to this 'Unit' twice for roughly two weeks each time I have not been able to find the answer yet, but I have noticed that each posting has an Order/Authority reference and hope to work this out by finding the original order.. The references are 5BEO 142/44 5BEO 150/44 I assume this reference means "5th Battalion Emergency/Executive Order (No.)/Year. Can anyone confirm or correct this analysis. And does anyone know if these records still exist and if so where they are kept ?