It doesn't apply because they do much more than just operate equipment.
Since you are concerned about correct word use, operations doesn't describe a person but operator does. A sailor's rating has to describe the person. Hence, when I was in the Navy I was a journalist not a journalism. When one sailor asks another (who's not in uniform), "What are you?" the reply would be, "I'm a radioman (rating) first class (rate/pay grade)." It wouldn't make sense to say, "I'm radio operations" because obviously that doesn't describe a person. It might describe a command department but that's not the same thing.
