Tin has officers and such and central command. They actually have a lot of officers. Granted these are almost entirely nobles which means they might not be the best commanders, but a noble general is usually a better choice than some uneducated commoner. It's also still a meritocracy. Nobles don't just buy their rank like in the British empire.

When I elaborate on my military I'll let you decide if it's really Blitzkrieg. It might not be of the trus/conventional sort, but I felt that the word is a fairly good way of describing their mindset concerning tanks and such.