leading seaman 
noun
A rank in the Royal Navy, above able seaman and below petty officer.The Navy's leading seamen cooks, leading seamen naval police coxswains and leading seamen photographers join the list of employment categories eligible for the benefit....
- They were led by a leading seaman aircraft technician from Albatross who, like many sailors living in the region, had joined the local volunteer fire brigade.
- He was born in York and after eight years in the Navy, where he rose to be a leading seaman, he worked at the factory until he retired.