Sailor first class

Sailor first class (Matelot de 1$re$ classe) is a rank used in the navies of many countries.

Canada
As of August 2020, the Royal Canadian Navy replaced the term seaman with the gender-neutral term sailor. Leading seamen are now referred to as "sailor first class" (often abbreviated as "S1").

NATO code
While the rank is used in a number of NATO countries, it is ranked differently depending on the country.