source: Highnunchicken ” And if all else fails, you can always sign on.” Singaporeans frequently joked about signing on as a backup plan for someone’s career. The option to sign on is readily available for certain industries such as defence and security due to our lack of manpower. Since National Service (NS) is a statutory requirement for all male Singaporeans, putting that signature onto the sign-on contract can be an immediate way to secure your career.