What was the GCT test?
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The Army General Classification Test which I believe was used by all of the services. I took it in the Marine Corps during a whole day of testing early on in boot camp.
The GCT part was a math test, a verbal test a pattern analysis test IIRC. I got a 142 GCT score but am not sure how that would stack up in comparison to an IQ test.
They also had tests on topics such as mechanics, electronics, Morse Code and other stuff that I've forgotten.
One thing I'm sure of----------everyone would have done a little better if they had more sleep and were not being terrorized by the DIs :