Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_21 (ship_types_delivered VARCHAR, total_vessels_built_for_usmc VARCHAR)
### Question:
what is the ship types delivered when the total vessels built for usmc is 13 ships for usmc (plus 37 more for usn)?
### Answer:
SELECT ship_types_delivered FROM table_name_21 WHERE total_vessels_built_for_usmc = "13 ships for usmc (plus 37 more for usn)"