Lead Ship

In the United States Navy , since the 20th Century to the present, the lead ship usually lends its name to the Ship Class , as in ''Pennsylvania'' Class Battleship , whose lead ship was USS ''Pennsylvania'' (BB-38) , or more recently ''Los Angeles'' Class Submarine named after USS ''Los Angeles'' (SSN-688) . Also, Hull Number s are sometimes used informally to refer to the class (such as the "688-class" in the case of the ''Los Angeles''-class). In other navies, the class can be named after either the lead ship (as in the Royal Navy 's ''Invincible''-class Carrier ) or after a theme (as in the Royal Navy's ''Tribal''-class Frigates ).

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