Analysis of information sources in references of the Wikipedia article "National Defense Authorization Act for Fiscal Year 2012" in English language version.
{{cite web}}: CS1 maint: archived copy as title (link).Section 1021, authorizes indefinite detention for the broad definition of "covered persons" .... And that section does provide that "Nothing in this section shall be construed to affect existing law or authorities relating to the detention of United States citizens, lawful resident aliens of the United States, or any other persons who are captured or arrested in the United States." So that section contains a disclaimer regarding an intention to expand detention powers for U.S. citizens, but does so only for the powers vested by that specific section. More important, the exclusion appears to extend only to U.S. citizens "captured or arrested in the United States" — meaning that the powers of indefinite detention vested by that section apply to U.S. citizens captured anywhere abroad (there is some grammatical vagueness on this point, but at the very least, there is a viable argument that the detention power in this section applies to U.S. citizens captured abroad).
{{cite web}}: CS1 maint: archived copy as title (link).