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UNCLASSIFIED Community Outreach in Field Offices Policy Guide 5. Recordkeeping Requirements 5.1. Filing System. All COS/COCs are to use the COP filing structure, which uses Classification. b7E HQ file numbers. Classification designated a permanent record by the approved Records Retention PIan for case files containing more than 60 serials while those with fewer than 60 serials shall be destroyed when 20 years old. The filing structure enables COS/COCs to self-evaluate their. programs by creating an accurate picture of their COP in its entirety. The CRU file plan contains the following: b7E 19 UNCLASSIFIED