Singapore's Immigration and Checkpoints Authority (ICA) has published the official conditions that foreign nationals must meet before they are eligible to apply for Singapore citizenship. According to the ICA, a foreigner holding Singapore Permanent Resident (PR) status may apply for citizenship after residing in the country as a PR for a minimum of two years, provided they are at least 21 years old. Singapore announces citizenship eligibility for foreigners, including residency criteria and National Service obligations for male applicants. National service obligation for male applicantsMale foreigners who obtain Singapore citizenship or PR status are subject to an additional requirement under the Enlistment Act 1970. All male Singapore citizens and PRs are obligated to serve National Service (NS), unless formally exempted.