ROC nationals with Overseas Chinese status are exempt from service. Draftees may also request alternative service, usually in community service areas, although the required service period would be longer than military service. Qualified draftees with graduate degrees in the sciences or engineering who pass officer candidate exams may also apply to fulfil their obligations in a national defense service option which involves three months of military training, followed by an officer commission in the reserves and four years working in technical jobs in the defense industry or government research institutions.