The U.S. Navy has several ratings or job specialties for its enlisted members. An enlisted member is known by the enlisted rating, for example a Machinist's Mate (MM), or by the enlisted rate, for example Petty Officer First Class (PO1). Often Navy enlisted members are addressed by a combination of rating and rate; in this example, this Machinist's Mate Petty Officer First Class may be addressed as Machinist's Mate 1st Class (MM1).
However, the NEC designator is a four-digit code that identifies skills and abilities beyond the standard (or outward) rating designator. According to Military Personnel Manual (MILSPERMAN) 1221-010, the NEC designator facilitates personnel planning, procurement, and selection for training; development of training requirements; promotion, distribution, assignment and the orderly call to active duty of inactive duty personnel in times of national emergency or mobilization.
For example, a person holding the NEC "MM-3385" is a nuclear-trained Machinist's Mate for surface ships, and a person with the NEC "MM-3355" is a nuclear-trained Machinist's Mate for submarines.
0746 - Advanced undersea MK-46 maintenance weapons smith (SN-SCPO)
0812 - Small arms marksmanship instructor (PO2-MCPO)
0814 - Crew served weapons (CSW) instructor (PO2-MCPO)
0857 - 25 mm machine gun system (MGS) MK 38 MOD gun weapon system (GWS) technician (SN-PO1)
0870 - MK 46 MOD 2 gun weapon system (GWS) technician (SN-SCPO)
0878 - MK-75 operator/maintainer (SN-CPO)
0879 - 5"/54 caliber gun system MK-45 MOD 1 and 2 operator/maintainer (SN-SCPO)
0880 - 5"/62 caliber MK 45 MOD 4 gun mount maintenance (SN-SCPO)
0979 - MK-41 VLS baseline IV through VII technician (SN-MCPO)
0981 - MK-41 VLS maintainer technician (SN-MCPO)
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References
NAVPERS 18068F Volume II the official manual of Navy Enlisted Classifications (NECs) published in BUPERS. April 2021
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