Original sentence: The ATC Ensign is hoisted and hauled down by a Cadet NCO (or exceptionally another member of the Squadron if an NCO is not available), whilst the salute should be given by a commissioned officer (or exceptionally the Duty NCO if an officer is not available)
Edited sentence: The ATC Ensign is hoisted and hauled down by a nominated member of the Squadron, sometimes a Cadet NCO, member of staff, or simply a Cadet who has been chosen, with the salute being taken by any commissioned officer, normally the squadron's Officer Commanding