Chapter 6 - Required Background Checks
USCIS conducts security and background checks on all applicants for naturalization. Members or former members of the U.S. armed forces applying for naturalization must comply with those requirements. This chapter provides information on specific background checks required of such applicants. This chapter also provides information on the ways service members may meet the fingerprint requirement for naturalization.
USCIS must conduct a Defense Clearance Investigative Index (DCII) query with the DOD as part of the background check process on any applicant with military service regardless of the section of law under which he or she is applying for naturalization. The DCII check is valid for 15 months from the initial response. The DCII check should show whether the applicant has any derogatory information in his or her military records. 
USCIS must collect fingerprint records as part of the background check process on most applicants for naturalization. The Kendell Frederick Citizenship Assistance Act (KFCAA) mandates USCIS to use enlistment fingerprints or previously submitted USCIS fingerprints to satisfy the fingerprint requirement for service members unless a more efficient method is available.
If DHS determines that new biometrics would “result in more timely and effective adjudication of the individual’s naturalization application,” DHS must inform the applicant of this determination and provide the applicant with information on how to submit fingerprints. 
The table below provides the ways in which a service member may meet the fingerprint requirement for naturalization on the basis of military service.  Such applicants may meet the requirement through any of the following ways provided in the table. These procedures aim at USCIS compliance with the KFCAA.
Ways Service Members may Meet Fingerprint Requirement for Naturalization
USCIS will consider an applicant’s naturalization application to be abandoned and will deny the application for failure to appear for biometrics capture (fingerprinting)  if all of the following conditions are true:
The NSC is unable to locate the applicant or three days have elapsed from the last day of the time period allotted for the applicant to appear for fingerprinting (as stated on the second ASC appointment notice);
The applicant is stationed stateside (and is otherwise able to report to an ASC) and has not submitted FD-258 fingerprint cards;
The applicant has not fulfilled the fingerprint requirement; and
USCIS has determined that the enlistment fingerprints are unavailable or are unclassifiable.
Any subsequent correspondence from an affected applicant whose application was denied for failure to appear for fingerprinting within one year is considered a Service motion to reopen.  USCIS grants the motion and continues with the processing of the naturalization application. USCIS does not deny an application for abandonment for failure to provide fingerprints if USCIS has evidence that the applicant is deployed inside the United States or overseas and is unable to be fingerprinted.
1. [^] Previously, a military applicant was required to submit Form G-325B, Biographic Information, which USCIS used to initiate the DCII query. USCIS determined, however, that the information collected on Form N-400 is sufficient to perform the queries and deemed Form G-325B obsolete. As of February 18, 2010, Form G-325B is no longer required for any pending naturalization application.
8 CFR 316.5(b)(6) - Residence for certain spouses of military personnel
8 CFR 316.6 - Physical presence for certain spouses of military personnel
8 U.S.C. 1443a - Overseas naturalization for service members and their qualifying spouses and children
Legislation Assisting Military Members and their Families Obtain Immigration Benefits
Appendix: Legislation Assisting Military Members and their Families Obtain Immigration Benefits
The table below provides some of the major legislative amendments that have aimed at assisting qualified military personnel and their eligible family members to become U.S. citizens or to acquire other immigration benefits, or both.
Act of May 9, 1918 (40 Stat. 512)
Modifications of 1918 Act 
Second War Powers Act of March 27, 1942 (amending Nationality Act of 1940)
Legislation of December 7, 1942 (amending Nationality Act of 1940)
Act of June 1, 1948; Immigration and Nationality Act
Lodge Act, June 30, 1950 (64 Stat. 316)
Korean Hostilities; Act of June 30, 1953 (Pub. L. 86)
Vietnam Hostilities Act of October 24, 1968 (82 Stat. 1343)
Grenada 15 Executive Order 12582 (February 2, 1987) 
Naturalization of Natives of the Philippines (WWII Service), Sec. 405 of Pub. L. 101-649
Hmong Veterans’ Naturalization Act of 2000
National Defense Authorization Act for Fiscal Year 2004 (Pub. L. 108-136)
National Defense Authorization Act for Fiscal Year 2008 (Pub. L. 110-181)
Kendell Frederick Citizenship Assistance Act (KFCAA) (Pub. L. 110-251)
Military Personnel Citizenship Processing Act (MPCPA) (Pub. L. 110-382)
1. [^] See Application of Campbell, 5 F.2d 247 (E.D. Wash. 1925). See Op. Sol. of Labor, Jan, 1926, CO file 79/9.
2. [^] See Acts of July 19 and November 6, 1919, May 26, 1926, March 4, 1929, May 25, 1932, June 24, 1935, August 23, 1937, June 21, 1939, December 7, 1942.
3. [^] See Executive Order 12582, signed on February 2, 1987 (52 FR 3395, February 4, 1987). In consideration of Matter of Reyes, 910 F. 2d 611 (9th Cir. 1990), Executive Order 12582 was revoked by Executive Order 12913, effective February 2, 1987, (59 FR 23115, May 4, 1994).
4. [^] See Sec. 1703 of PL 108-136.
5. [^] See Sec. 673 of PL 110-181.
Technical Update - Replacing the Term “Foreign National”October 08, 2019
This technical update replaces all instances of the term “foreign national” with “alien” throughout the Policy Manual as used to refer to a person who meets the definition provided in INA 101(a)(3) [“any person not a citizen or national of the United States”].
POLICY ALERT - Defining “Residence” in Statutory Provisions Related to CitizenshipAugust 28, 2019
U.S. Citizenship and Immigration Services (USCIS) is issuing policy guidance in the USCIS Policy Manual to address requirements for “residence” in statutory provisions related to citizenship, and to rescind previous guidance regarding children of U.S. government employees and members of the U.S. armed forces employed or stationed outside the United States. This guidance becomes effective October 29, 2019.
POLICY ALERT - Comprehensive Citizenship and Naturalization Policy GuidanceJanuary 07, 2013
USCIS is issuing updated and comprehensive citizenship and naturalization policy guidance in the new USCIS Policy Manual.