The link you followed will bring you to this page:

https://www.google.it/url?sa=t&source=web&rct=j&url=https://www.difesa.it/SGD-DNA/Staff/DG/PERSOMIL/Documentazione/Documents/fogli_matricolari_2017/05GuidaMatricolareMarinaMilitareParte2.pdf&ved=2ahUKEwjur4_z1OnaAhUjDJoKHQkzBw4QFjACegQICRAB&usg=AOvVaw1Y2-4kl7XLY966XmUd8M72