Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name | Nationality | Position | Appearances | Starts | Minutes | Goals |
| --- | --- | --- | --- | --- | --- | --- |
| Lori Chalupny Category:Articles with hCards | United States | MF | 1.0 | 1.0 | 90.0 | 0.0 |
| Amanda Cinalli Category:Articles with hCards | United States | FW | 1.0 | 1.0 | 90.0 | 0.0 |
| Niki Cross Category:Articles with hCards | United States | DF | 1.0 | 0.0 | 30.0 | 0.0 |
| Tina Ellertson Category:Articles with hCards | United States | DF | 1.0 | 1.0 | 90.0 | 0.0 |
| Kendall Fletcher Category:Articles with hCards | United States | DF | 1.0 | 1.0 | 90.0 | 0.0 |
| Stephanie Logterman Category:Articles with hCards | United States | DF | 1.0 | 0.0 | 26.0 | 0.0 |
| Kia McNeill Category:Articles with hCards | United States | DF | 1.0 | 1.0 | 64.0 | 0.0 |
| Ashlee Pistorius Category:Articles with hCards | United States | FW | 1.0 | 0.0 | 19.0 | 0.0 |
| Hope Solo Category:Articles with hCards | United States | GK | 1.0 | 1.0 | 90.0 | 0.0 |
| Melissa Tancredi Category:Articles with hCards | Canada | FW | 1.0 | 1.0 | 90.0 | 0.0 |
| Sarah Walsh Category:Articles with hCards | Australia | FW | 1.0 | 1.0 | 90.0 | 0.0 |
| Elise Weber Category:Articles with hCards | United States | DF | 1.0 | 1.0 | 90.0 | 0.0 |
| Christie Welsh Category:Articles with hCards | United States | FW | 1.0 | 1.0 | 71.0 | 0.0 |
Question:
What is the position of the player who is from the United States and has 30 minutes? 
Answer:
DF