Countries by reserve personnel

The number of military personnel in the reserve forces that are not normally kept under arms, whose role is to be available to mobilize when necessary.

Military service is service by an individual or group in an army or other militia, whether as a chosen job or as a result of an involuntary draft. A nation with a fully volunteer military does not normally require mandatory military service from its citizens, unless it is faced with a recruitment crisis during a time of war.