You'd be surprised at what relationships might exist.
I used to work for a well-known manufacturer of window air-conditioners.
Although we were not a direct military contractor, we routinely shipped a small (but lucrative) quantity of the crucial "guts" of the compressor we made to a smaller company that "refined" them to mil-spec standards for quality and reliablity. Because of our unique design, it became the preferred component for the air-conditioning in the cockpits of one of our jet fighters.
I would guess that some of the pumps that Maytag makes for their washers/dishwashers may have a similar application. But who knows? Domestic appliance manufacturers make a helluva lot of different components that could find use in military equipment. It's not exotic stuff, but the military needs it just the same.