So of course I had to go and consult a real dictionary - Websters second Ed 1958 (referred to in our house as "big book" - 300 x 200 x 130 and weight over 4 kg). Anyway "Militia" gets a surprisingly brief entry especially considering it is an American dictionary but even so, every thing seems to be plural - citizens, soldiers, armed forces, reserves; nothing that defines militia in the singular.
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