Not citizens, just members of the militia in federal service.
"Clause 16. The Congress shall have Power * * * To provide for organizing, arming, and disciplining, the Militia, and for governing such Part of them as may be employed in the Service of the United States, reserving to the States respectively, the Appointment of the Officers, and the Authority of training the Militia according to the discipline prescribed by Congress."
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Article I. Legislative Department › The Militia Clauses
The Militia Clauses
Clause 15. The Congress shall have Power * * * To provide for calling forth the Militia to execute the Laws of the Union, suppress Insurrections and repel Invasions.
Clause 16. The Congress shall have Power * * * To provide for organizing, arming, and disciplining, the Militia, and for governing such Part of them as may be employed in the Service of the United States, reserving to the States respectively, the Appointment of the Officers, and the Authority of training the Militia according to the discipline prescribed by Congress.
ANNOTATIONS
Calling Out the Militia
The states as well as Congress may prescribe penalties for failure to obey the President’s call of the militia. They also have a concurrent power to aid the National Government by calls under their own authority, and in emergencies may use "the militia to put down armed insurrection.
1784 The Federal Government may call out the militia in case of civil war; its authority to suppress rebellion is found in the power to suppress insurrection and to carry on war.
1785 The act of February 28, 1795,
1786 which delegated to the President the power to call out the militia, was held constitutional.
1787 A militiaman who refused to obey such a call was not “employed in the service of the United States so as to be subject to the article of war,” but was liable to be tried for disobedience of the act of 1795."
, of the U.S. Constitution: Analysis and Interpretation
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Note that the miltiaman was not to be considered in the service and subject to the discipline of such service until the militia was mustered and the militiaman showed up. The "discipline" over the militia only exists when the militia is in federal service.