what the best economic system for devolpming the army ?

Answer 1

Almost any. (ie no system is best, depending on what you mean)
A centralized (planned) economy can direct funds from consumer goods to military goods. Not good for the citizens but good for the powerful.
A market economy raises taxes to support the military. The citizens are happy (as long as the tax isn't too high) and you still have your arm.
A mixed economy has elements of both.

Answer 2

From Education to Production.