I have construction photos of the house being built, and they showed metal studs, also, when I test drilled, I did not hit wood. You have a very interesting point, so I pulled the house plans, and the section for a 'typical' outside wall does state firing strips, however the construction photos show metal between the insulation, so I guess mine is different.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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