Nothing in this discussion has prevented people from typing the names of American scuba equipment manufacturers. The sad fact is that there aren't many, so that topic was pretty much exhausted after the first few answers that directly addressed the original question.
Right, so instead of letting it go we have to talk about a bunch of macro-ecky. Maybe this should be moved to the pub.
As for buying American, if it makes a guy or girl feel good to buy American, more power to them. I don't shop at Walmart or any corporate coffe shop, I patronize my local businesses (many of whom are my neighbors). That's my choice, just like it is the OP's choice to want to buy American. I also choose to drive only German cars, and that's my choice too.