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_68 (propulsion VARCHAR, order_year VARCHAR, manufacturer VARCHAR)
### Question:
What is the Propulsion for the model offered in 2003-2004 by neoplan usa?
### Answer:
SELECT propulsion FROM table_name_68 WHERE order_year = "2003-2004" AND manufacturer = "neoplan usa"