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 (or MM or by the enlisted rate, for example Petty Officer First Class (or 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 (or MM1).
However, the NEC designator is a four-digit code that identifies skills and abilities beyond the standard (or outward) rating designator. According to the 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 MM-3385 is a nuclear-trained machinist's mate for surface ships, and a person with an 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 - 25mm 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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