I was most interested to see that members of the No. 1 Overseas Column - Civil Defence Reserve were allowed to wear the shoulder flash of the 21st Army Group. The No. 1 Overseas Column were sent to work in Antwerp in early January 1945 and also wore a special shoulder title. They came under the control of 21st Army Group and this file in the National Archives has a report on the issue of the badge.
The design of the badge - a blue cross on a red shield - was that of 21st Army Group but without the crossed crusader swords. It was worn by all ranks of 21st Army Group GHQ (General Headquarters) Troops, by Lines of Communication (L of C) formations and units not allotted to lower formations with their own badge.
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