CREATE TABLE table_71248 ("Date" CLOB, "Location" CLOB, "Nature of incident" CLOB, "Circumstances" CLOB, "Casualties" CLOB)

When was the location 15km NW of Pol-E Khomri, the circumstaances IED and the casualties of 1 WIA?
SELECT "Date" FROM table_71248 WHERE "Casualties" = '1 wia' AND "Circumstances" = 'ied' AND "Location" = '15km nw of pol-e khomri'
SELECT "Date" FROM "table_71248" WHERE "Casualties" = '1 wia' AND "Circumstances" = 'ied' AND "Location" = '15km nw of pol-e khomri'