Which rates combine to form the position of EQCM?

The position of Equipment Control Master Chief (EQCM) is formed by the combination of specific rates that align with the responsibilities and qualifications required for the role. In this case, the combination of CMCS (Chief Machinist's Mate Submarine) and EOCS (Electronics Maintenance Chief Submarine) is correct because both positions encompass critical technical expertise in machinery and electronic systems, which are vital for managing equipment on submarines.

CMCS involves significant knowledge of mechanical systems, maintenance procedures, and team leadership in a submarine environment. Meanwhile, EOCS focuses on the electronics and electrical systems that are equally essential for operational readiness. Together, these ratings provide a comprehensive skill set necessary for the effective management of all equipment aboard a submarine, making this combination particularly suitable for the responsibilities of an EQCM.

The other options consist of rate combinations that do not align as closely with the necessary technical and leadership skills required for the EQCM role.