If you would like a more detailed answer, and if you are interested, I invite you to read my new IRPP study on this very subject that was published last month. It is entitled: Accountability for National Defence: Ministerial Responsibility, Military Command and Parliamentary Oversight.
However, to answer your question quickly, Parliament does indeed have a responsibility to review government decisions. However, in order for a government to be competent and fully responsible for its policies, it must be the one making the decisions.
The role of the committee is to advise the government. Simply put, your primary role is to review government decisions and to ensure that the government acts responsibly, not to make the decisions yourself.