The May 1953 issue of Popular Science including the following 2 jeep-related short blurbs:
Cold Alaska has so much warm water (from volcanic springs) that 17 new Jeep fire engines being sent there for civil-defense duty are equipped with special “heat exchangers.” They’ll cool the water sprayed on fires — cold water put out fires faster.
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The same issue also includes an unrelated mention of the new M-170: