user: Question: When was the location 15km NW of Pol-e Khomri, the circumstaances IED and the casualties of 1 WIA?
Columns: ['Date', 'Location', 'Nature of incident', 'Circumstances', 'Casualties']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['2011-01-11', 'Pol-e Khomri', 'Non-hostile', 'Accidental discharge', '1 injured']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Casualties" = '1 WIA' AND "Circumstances" = 'IED' AND "Location" = '15km NW of Pol-e Khomri';