Aircraft Marshaller
Or the bloke who gets all the flak when the bloke in the left seat at the front thinks he knows better and gets it all wrong. Not so much needed at main airports where they should all be capable of following a line and a load of numbers painted on the ground but much more important if operating away from base. Generally he is to be obeyed unless there is a significant difference of opinion beween his directions and what the A/C captain thinks is safe. Known to personal experience on an airfield in Norway where I was marshalling the aircraft to follow a snow covered taxiway, the captain decided he knew better, taxied straight ahead across the snow and across the unprepared ground between the taxiways, almost bogged the aircraft down and left us some very big ruts to explain away to the Norwegian authorities