Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: 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)?

### Accurate SQL ###

SELECT ship_types_delivered FROM table_name_21 WHERE total_vessels_built_for_usmc = "13 ships for usmc (plus 37 more for usn)"