The replies in this thread are absolutely hilarious.
Butttt, back to reality, I THINK what they are trying to tell you is.... EVERYONE CLEANS
EM- Maintain electrical equipment, switchboards, circuit breakers, motors, generators etc etc
ET- Sit in air conditioned room and play magic the gathering in free time, but really are the REACTOR OPERATORS they sit at the little panel and mess everything up and then the EM's and MM's have to figure out what they did and fix it.
MM- Maintain pumps, valves, take samples from the plant (ELT) , club each other with hammers