I've been watching re-runs of Colditz, and this phrase keeps coming up. Why is it an Officers duty to escape? (other than to cause maximum inconvenience and tie down the enemies resource looking for them) Are enlisted personnel discouraged or forbidden from escaping? Should all Officers escape, or should some remain to ensure the welfare of those who remain and the enlisted POWs? Is there anything formally written down or taught about this duty at Sandhurst?