Context: The Canadian Armed Forces have a total reserve force of approximately 50,000 primary and supplementary that can be called upon in times of national emergency or threat. For the components and sub-components of the Canadian Armed Forces Reserve Force, the order of precedence follows:

Question: When can the reserve force be called upon?
Answer: in times of national emergency or threat

Question: What troops does The reserve force consists of?
Answer: primary and supplementary

Question: When can't the reserve force be called upon?
Answer: Unanswerable

Question:  What troops does The reserve force not consist of?
Answer: Unanswerable