Careers Career Paths USMC Enlisted Job Descriptions and Qualification Factors Share PINTEREST Email Print John Moore / Staff/Getty Images News/Getty Images Career Paths US Military Careers Technology Careers Sports Careers Sales Project Management Professional Writer Music Careers Media Legal Careers Government Careers Finance Careers Fiction Writing Careers Entertainment Careers Criminology Careers Book Publishing Aviation Animal Careers Advertising Learn More By Rod Powers Rod Powers Air Force NCO Academy Rod Powers was a retired Air Force First Sergeant with 22 years of active duty service. Learn about our Editorial Process Updated on 12/02/18 The engineer, construction, facilities, and equipment OccFld comprises Marines whose duties include metalworking and welding; repair, maintenance, and operation of engineer heavy equipment. such as cranes and bulldozers; construction and repair of military structures and facilities; clearing and emplacing obstacles such as minefields; construction of standard and nonstandard bridging; and emplacing and detonating explosives for construction and demolition projects. Also, some Marines in the field work with the storage and distribution of bulk fuel products. Marines entering the field receive MOS 1300, Basic Engineer, Construction, and Equipment Marine. The basic Marine may be assigned a variety of MOSS and may be sent to a variety of formal schools. The MOSS that initially are available are metal worker, engineer equipment mechanic, engineer equipment operator, combat engineer, engineer assistant, and bulk fuel specialist. The opportunity to participate in a formal apprenticeship program leading to receipt of a Department of Labor Certificate of Apprenticeship Completion may be available in some MOSS within OccFld 1300; refer to MCO 1550.22 for specific information concerning this program. There are a variety of challenging and interesting billets available in OccFld 13, ranging from inspector-instructor duty to duty within the Marine divisions, force service support groups, and Marine aircraft wings. Marine Corps Enlisted Military Occupation Specialties in Field 13 1316 - Metal Worker 1341 - Engineer Equipment Mechanic 1342 - Small Craft Mechanic 1343 - Assault Breacher Vehicle/Joint Assault Bridge (JAB) Mechanic 1345 - Engineer Equipment Operator 1349 - Engineer Equipment Chief 1361 - Engineer Assistant 1371 - Combat Engineer 1372 - Assault Breacher Vehicle