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_2596811_12 (complement VARCHAR, killed VARCHAR)
### Question:
What was the complement for the unit that had 3 off 37 men killed?
### Answer:
SELECT complement FROM table_2596811_12 WHERE killed = "3 off 37 men"