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_2596811_12 (complement VARCHAR, killed VARCHAR)

### Question ###
What was the complement for the unit that had 3 off 37 men killed?

### Accurate SQL ###

SELECT complement FROM table_2596811_12 WHERE killed = "3 off 37 men"