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_11552751_2 ( ship_types_delivered VARCHAR )

### Question ###
What was the delivery date when s2 (lst) type, s2 (frigate) type, c1-m type was delivered?

### Accurate SQL ###

SELECT 1 AS st_ship_delivery_date FROM table_11552751_2 WHERE ship_types_delivered = "S2 (LST) type, S2 (frigate) type, C1-M type"