MIL-STD-196F
4.2.5.1 Modification letter for a variable item level. Modification letters will be assigned to type designators for variable systems, subsystems, centers, centrals, sets and groups, in the same manner for those items that are definitive, except that the modification letter precedes a variable (V) or a plug-in (P), as applicable. Examples of these type of assignments are an AN/FPS-
6A(V).
4.2.5.2 Modification letter for specific configuration of a variable item level. An assignment of a modification letter to a specific configuration of a variable system, subsystem, center, central, set, or group does not require other definitive configurations within that numeric family to change. For example an AN/ACR-75A(V)3 will not require a change to the AN/ARC-75(V)1 or the AN/ARC-75(V)2, but will require assignment of the basic A(V).
4.2.5.3 Specific letters not to be assigned. The letters "I", "O", "Q", "S", "T", "X", "Y", and
"Z" shall not be assigned as modification letters.
4.2.6 Cancellation of nomenclatures. When a DCP requests cancellation of a nomenclature, the appropriate subparagraph will be referenced on the DD Form 61:
a. There has been no procurement of the item, and none is anticipated. b. There are presently no experimental models.
c. No further use of the type designator is required for developmental purposes. d. The item is no longer in service inventory.
e. A change from either "plain to a variable" or "variable to a plain.
4.2.6.1 Reinstatement of cancelled nomenclatures. Cancelled nomenclatures will not be reinstated except upon request of, or coordinated approval of, the Department Control Point that requested the nomenclature originally.
4.3 Security Classification. All officially assigned JETDAS nomenclatures shall be unclassified to provide a ready means of identification in correspondence and other forms of communication.
4.3.1 Classification identification. Requests for nomenclature (DD Form 61) shall include both the security classification of the item described (hardware) and the classification of the information contained thereon (data).
4.3.2 Classified requests. All classified requests for nomenclature shall be submitted through the JETDAS database, noted in block 7 (Security Classification of Equipment) as "Classified" with minimal information. The designated DCP will have a hard copy of the filled in DD Form
61 secured.
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