Sailor first class (French: Matelot de 1re classe) is a rank used in the navies of many countries.
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").
[1][2][3] While the rank is used in a number of NATO countries, it is ranked differently depending on the country.