Why are you mentioning the reason the fitness test was brought in? It’s irrelevant. Any person taking a salary for being a police officer should be able to reach 5.4 which is barely a hair’s breadth above a fast walk. Even people in their mid/late 50’s should be able to do 5.4 if they had any self respect, particularly if it was part of their role that they’re getting well paid for. As for the injured officers - they either pass once recovered or get pentioned off in my opinion.
If a soldier gets injured in battle and can no longer operate effectively do they get to stay on the payroll for the rest of their career? No.