The U.S. Navy has several ratings or job specialties for its enlisted members.
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).
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.
0160 - Causeway barge ferry pilot PO2-MCPO 0161 - YTB/YT tugmaster PO1-MCPO 0164 - Patrol boat coxswain SN-PO1 0167 - LCAC operator CPO-MCPO 0169 - Causeway barge ferry coxswain PO3-PO1 0170 - Surface rescue swimmer SN-MCPO 0171 - Landing craft utility craftmaster PO1-MCPO 0172 - LCAC loadmaster SN-PO1 0181 - Navy lighterage deck supervisor PO3-PO1 0190 - Force protection boat coxswain PO3-PO1 0199 - Boatswain's mate basic 0202 - Assistant navigator PO1-MCPO 0215 - Harbor/docking pilot PO1-MCPO 0299 - Quartermaster basic 0302 - AN/SYS-2 integrated automatic detection and tracking (IADT) systems operator SN-CPO 0304 - LCAC radar operator/navigator PO2-CPO 0318 - Air intercept controller PO2-PO1 0319 - Supervisory air intercept controller PO1-MCPO 0324 - ASW/SUW tactical air controller (ASTAC) PO2-MCPO 0327 - Sea combat air controller (SCAC) SN-CPO 0328 - ASW/ASUW tactical air control (ASTAC) leadership CPO-MCPO 0334 - HARPOON (AN/SWG-1A) engagement planning operator PO3-MCPO 0336 - Tactical/mobile (TacMobile) operations control (OPCON) operator SN-CPO 0340 - Global command and control system common operational picture/maritime 4.X (GCCS COP/M 4.X) operator SN-MCPO 0342 - Global command and control system common operational picture/maritime (GCCS COP/M) operator SN-MCPO 0345 - Joint tactical ground station (JTAGS)/multi-mission mobile processor (M3P) system operator/maintainer PO3-CPO 0346 - AEGIS console operator track 3 SN-MCPo 0347 - Ship self defense system (SSDS) MK1 operator SN-PO1 0348 - Multi-tactical digital information link operator (TADIL) PO3-MCPO 0349 - SSDS MK 2 advanced operator SN-CPO 0350 - Interface control officer (ICO) PO1-MCPO 0356 - Global command and control system-maritime (4.1) increment 2 (GCCS-M 4.1 Inc 2) operator SR-MCPO 0399 - Operations specialist basic 1523 - AN/SPN-35 amphibious air traffic control radar technician 0402 - AN/SQQ-89(V)2/9 active sonar level II technician/operator petty officer - chief 0410 - AN/SLQ-48(V) mine neutralization systems (MNS) operator/maintenance technician SN-MCPO 0411 - AN/SQQ-89(V)4/6 sonar subsystem level I operator SN-PO1 0414 - AN/SQQ-89(V)3/5 active sonar level II technician/operator PO3-SCPO 0415 - AN/SQQ-89(V) 2/3/4/6/7/8/9/12 passive sonar level II technician/operator PO3-SCPO 0416 - Acoustic intelligence specialist PO1-MCPO 0417 - ASW specialist CPO-MCPO 0425 - AN/BQQ-6 Trident level III master operation and maintenance technician PO2-MCPO 0430 - Underwater fire control system MK-116 MOD 7 anti-submarine warfare control system operator PO2-MCPO 0450 - Journeyman level acoustic analyst PO2-MCPO 0455 - AN/SQQ-89(V) 4/6 active sonar level II technician PO3-SCPO 0461 - AN/BSY-2(V) advanced maintainer PO3-MCPO 0466 - Journeyman surface ship USW supervisor PO2-SCPO 0501 - Sonar (submarines) leading chief petty officer PO1-MCPO 0505 - Integrated undersea surveillance system (IUSS) analyst SN-SCPO 0506 - Integrated undersea surveillance system (IUSS) maintenance technician SN-SCPO 0507 - Integrated undersea surveillance system (IUSS) master analyst PO2-SCPO 0509 - AN/SQQ-89 (V) adjunct subsystem level II technician PO3-SCPO 0510 - AN/SQS-53D sensor subsystem level II technician/operator SSN-CPO 0511 - AN/SQQ-89(V) 11/12 sonar subsystem level I operator SN-PO1 0512 - AN/BSY-1 and AN/BQQ-5E combined retained equipment maintenance technician PO3-SCPO 0518 - Sonar technician AN/BQQ-10(V) operator/maintainer PO3-SCPO 0520 - Sonar, combat control and architecture equipment technician PO2-SCPO 0521 - AN/SQQ-89(V)15 sonar system level I operator SN-PO1 0522 - AN/SQQ-89(V)15 sonar system level II technician PO3-MCPO 0523 - AN/SQQ-89(V)15 sonar system journeyman PO2-SCPO 0524 - AN/SQQ-89A(V)15/(V)15 EC204 surface ship USW combat systems senor operator SN-PO1 0525 - AN/SQQ-89A(V)15 surface ship USW combat systems maintenance technician PO3-SCPO 0527 - AN/SQQ-89A(V)15/(V)15 EC204 surface ship USW combat systems journeyman PO2-CPO 0530 - AN/BQQ-10(V) TI-10/12 operator/maintainer PO3-SCPO 0540 - AN/SQQ-34C (V) 2 aircraft carrier tactical support center (CV-TSC) operator PO3-SCPO 0541 - AN/SQQ-34C (V) 2 aircraft carrier tactical support center (CV-TSC) maintenance technicians PO3-PO1 0550 - Integrated undersea surveillance system (IUSS) passive sensor operator (PSO) SN-SCPO 0551 - Integrated undersea surveillance system (IUSS) supervisor PO2-SCPO 0552 - Integrated undersea surveillance system (IUSS) low frequency active (LFA)/compact low frequency active (CLFA) operator SN-SCPO 0553 - Integrated undersea surveillance system (IUSS) SURTASS mission commander CPO-MCPO 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)