The military involved a system of militiamen between the ages of 21 and 60 who were allocated areas of land. Officers were given extended commissions. But regular soldiers reported for duty in the provincial capital on a rotating basis, depending on how far away they lived from the capital. Individuals who lived 500 li (li is half a kilometer) from the capital served one month in five, and those over 2000 li away served for two months out of every eighteen.