Which is the primary reference used to prepare standard letters? SECNAV M-5210.2, Department of the Navy Standard

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Which is the primary reference used to prepare standard letters? SECNAV M-5210.2, Department of the Navy Standard Subject Identification Code Manual SECNAV M-5210.1, Department of the Navy Records Management Manual MCO 5230.18, Clearance of Department of Defense Information for Public Release SECNAV M-5216.5, Department of the Navy Correspondence Manual