Primary are those constantly in arms. Secondary can be called to arms in times of need. The military capability of each troop type depends heavily on its military organization. Based on military organization, scope and special modifiers, the military force and size of the troops is determined. More details on this can be found the from the military conflict page.
Military force describes the effectiveness of the military unit.
Military force may be temporarily increased by training the troops. Military size is the size of the military unit. Absolute size depends on the scope of the society. The size of military units may be temporarily raised, but this is economically unstable solution - the men are needed on the fields to grow food. Economics Crafts Crafts refines the definition given by 'Technological base'.