Proposed subsection 165.21(5) states that the person may no longer wish to carry out their duties; that's very clear.
However, when someone is released from the Canadian Forces—be it for medical reasons or at their request—they cease to perform their duties. I don't understand how the words “at his or her request” are relevant. It seems to me that this adds some confusion. The person stopped performing their duties either when they were released from the Canadian Forces, when they attained the age of 60 years, or when they resigned under proposed subsection 165.21(5).