As I understand it, it's basically that the release itself is the responsibility of the Minister of National Defence. But a release that is attributable to medical reasons is the responsibility of the Minister of Veterans Affairs. And if it's not specified, it's not clear who has the responsibility to determine medical reasons attributable to service or not, and the release itself, which is the responsibility of the Minister of National Defence.
On October 29th, 2014. See this statement in context.