 By the time of the Second Reich reservists were already being given so-called "war arrangements" following the completion of their military service, which contained exact instructions relating to the conduct of reservists in time of war.In some countries, for example the United States, reservists are often former military members who reached the end of their enlistment or resigned their commission.Indeed, service in the reserves for a number of years after leaving active service is required in the enlistment contracts and commissioning orders of many nations.