In addition to Kai's comment, the CAP articles both use Cluster in the recipes. Cluster used to be 80% of the US hop crop, and has a distinct old time taste. I don't think they use much in Busch, but I could be wrong. I think that Busch would also use more corn in the fermentables.
The first time I had Jeff Renners CAP at a club meeting, I was transported back to the late 1950's time frame, as I was stealing a sip off of my Dad's beer. The CAP is that kind of a beer, back when Americna beers had flavor and were pretty good.