No one uses the english system. For some strange reason some of off-site contracting companies do. I keep waiting for them to bring out the leaches. Keep in mind that it is hard enough to get the average citizen to understand much of anything that goes on, assuming he has any inclination to do so. The least we can do is communicate to him in a language he can understand.
Stupidity has momentum.
The lack of the use of the metric system in the public materials related to this program almost totally negate any educational value that they might have had. Well, they don't seem to have that problem with other NASA publications. Those few that are totally lost on metric units might benefit from some educational leadership here.