Means someone is not concerned, in otherwords it refers to a select group.
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concerned - involved in or affected by or having a claim to or share in; "a memorandum to those concerned"; "an enterprise in which three men are concerned"; "factors concerned in the rise and fall of epidemics"; "the interested parties met to discuss the business"
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http://www.thefreedictionary.com/concerned
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Paragraph 8 on the March 1939 paper (your favourite) makes the 16 + 2 squadrons by September 1940 conditional, based on supply.
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And here we have the units concerned......