Lawful Permanent Residents (LPRS) of the United States who have held such status for five years or three years (if married to a US citizen) are eligible to submit naturalization applications to the U.S. Citizenship and Immigration Services (USCIS). LPRs must prove that they are persons of "good moral character," that they are not disqualified due to certain criminal convictions, that they have an understanding of U.S. history and the English language, and that they have met certain physical presence and residency requirements in order to obtain citizenship. Note: Some applicants for citizenship may be exempt from the English/Civics requirements if they are disabled, and/or meet certain age and residency requirements.