1st Special Service Brigade with No. 3, No. 4, No. 6 and No.45 (RM) Commandos.
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2nd Special Service Brigade with No. 2, No. 9, No. 40 (RM) and No. 43 (RM) Commandos.
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3rd Special Service Brigade with No. 1, No. 5, No. 42 (RM) and No. 44 (RM) Commandos.
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4th Special Service Brigade with No. 10 (Inter-Allied), No. 41 (RM), No. 46 (RM), No. 47 (RM) and No. 48 (RM) Commandos.
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By the autumn of 1940 more than 2,000 men had volunteered for Commando training, and what became known as the Special Service Brigade was formed into 12 units called Commandos.