Exit Health Monitoring I have seen companies overseas do this as a matter of course and in that case, from a medical point of view, the purpose and benefit is questionable, especially if appropriate monitoring has already been performed. It may be different from a legal perspective.
Could be medically justified if role has involved an overseas posting to a tropical area where asymptomatic infections could be screened for although this is controversial.
Slightly different to your question, but an exit medical could be useful in specific cases where it is already known that significant illness, injury or exposure has occurred in the role. Purpose being to document current state of health, ensure that appropriate medical management/ education is in place.