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_9 (tankers VARCHAR, staffing VARCHAR, hazmat VARCHAR, platforms VARCHAR)
### Question:
Which Tankers have a Hazmat of –, and Platforms of –, and a Staffing of volunteer?
### Answer:
SELECT tankers FROM table_name_9 WHERE hazmat = "–" AND platforms = "–" AND staffing = "volunteer"