ICUS is a good way of building up faked command hours. I have often seen log books where the so-called ICUS pilot has logged it as command, conveniently forgetting that he is under supervision NOT in command. Any chief pilot/CFI who interviews a prospective pilot employee is wise to closely scrutinize his log book for this very common rort. I once saw a log book which showed 600 hours ICUS DC-3 and Learjet. Very impressive until you read more closely to find out the guy only had a second class endorsement on these types. Saw the same rort on a B737 pilot's logbook, too.