I'm a very ardent SI-system advocate, but:
The imperial system has one and only one distinct advantage over metric. Specifically, the names of the measurements are much better to the ear (to an English speaker, at least). Yard, foot, inch, mile, pound, ounce etc just have a nicer and more satisfying sound than metre, centimetre, kilogram and so on.
Maybe Dave was using the better sounding (and more old-timey) measurements everywhere for the sake of flavour and atmosphere, except where it was a practical impediment, namely in tactical situations.
Cheers,
-Kyle
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