Final answer:
Marine Corps Electronic Security System (MCESS) Operators must be military police with specific MOS codes, trained in various security protocols including the experienced impact of pepper spray for empathetic use.
Step-by-step explanation:
The question pertains to Marine Corps Electronic Security System (MCESS) Operators, who are required to be military police personnel with specific Military Occupational Specialty (MOS) codes. These individuals are trained to monitor sophisticated security systems and are equipped with skills to handle various threats, including the operation of equipment to detect explosives and weapons. Part of their comprehensive training may include experiencing the effects of pepper spray to understand its impact and to use it with greater empathy and restraint.