Commanders (yes Cpl all the way up to Air Mshl) do you not have a duty of care to ensure those whom you command are of the right fitness level to carry out ALL duties to which they can, and are, called upon to complete - at the same time YOU MUST be of the same level to carry out those same duties. I think this then comes back to ensuring all ranks complete PT, perhaps as a Sqn PT session, which will then bring back some of the lost 'Esprit de corps'.