This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

Passage: Land Forces during this period also deployed in support of peacekeeping operations within United Nations sanctioned conflicts. The nature of the Canadian Forces has continued to evolve. They have been deployed in Afghanistan until 2011, under the NATO-led United Nations International Security Assistance Force (ISAF), at the request of the Government of Afghanistan. Question: Until when were Canadian forces in Afghanistan?
2011