While N/S is not stated in the lists of applicable sources, the generally acceptable meaning for N/S is not specified. Below is a list of applicable codes that are supposed to be used in the DD 1423:

SS *Source(DD Form 250) *Source(DD Form 250);  DD Destination(DD Form 250) Destination(DD Form 250)

SD *Source(DD Form 250) Destination(DD Form 250);  DS Destination(DD Form 250) *Source(DD Form 250)

LT Letter of Transmittal only;

NO No inspection or acceptance required

XX Inspection/acceptance requirements specified elsewhere in the contract.

*Source indicates contractor's facility,