I also ran across this. A diminutive but comprehensive Friend or Foe? Museum of Aircraft Recognition that is located in Santa Barbara, California as an adjunct to the CollectAir aviation art gallery. The museum is dedicated to the exhibit of teaching materials used by the armed forces during World War II to train gunners and aircrew in the identification of aircraft, ships and ground vehicles. The ability of servicemen to identify "friend or foe" in an instant was crucial to combat survival and the subject of recognition was taught in just about every World War II service school.

http://www.commercemarketplace.com/h...ir/Museum.html

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Enjoyable article, I was intrigued by the Ground Observer Corps or 'GOC' in the states as I was briefly in the Royal Observer Corps or 'ROC' who had the same role in the UK, though by my time it was all about nuclear plotting and going down the pub. Sadly I never saw a plane or even a pair of binoculars the whole time. Lots of writing backwards though...
Cheers for that,
Adam.