His work is supervised by his base, as well as by the rest of the country. No one person does the supervising all by himself, but it does get done.
Of course, not in this case, which is why the alarms are going off.
Look, dunce, your use of "supervision" isn't apt. Give it up. You can repeat it over and over but it doesn't work. How many times do people have to tell you before you get the message?