Final answer:
The Medical Equipment Custodian is responsible for supported unit equipment on the MEMO account in military health systems.
Step-by-step explanation:
In the context of military health systems, MEMO stands for Medical Equipment Management Office. The individual responsible for all supported unit equipment on the MEMO account is C) Medical Equipment Custodian. This role is integral to ensuring that all medical equipment is accounted for, properly maintained, and ready for use. While other roles within a medical unit, such as Unit Commanders and Medical Logistics Officers, have their own respective responsibilities, it is the Medical Equipment Custodian who is directly in charge of the equipment under the MEMO.