If you bring other boots not specified in the appointee packet (i.e. Nike or other lightweight boots) is it less likely that you will be allowed to wear them during BCT?
I would say so especially since one requirement is that they are waterproof and there are almost no other type of waterproof boot. I got 690s they are light and great
I am bringing a pair of Nike SFB's. They fit all of the requirements listed in the appointee packet. Don't see a reason you would not be allowed to wear them.