Pictures
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Boscombe Home Guard Captain Insignia (from John Pidgeon)
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Wimborne Home Guard Major Insignia (from John Pidgeon)
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2nd Lieutenant Insignia
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Lieutenant Insignia
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Captain Insignia
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Major insignia
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The Auxiliary Units used the rank insignia of the regular army. Area and Group Commanders were given ranks of 2nd Lieutenant, Lieutenant, Captain and occasionally Major though this rank seems reserved for a historical rank.
References
John Pidgeon