if Navi told me that, I would first use Rambam’s method to test the Navi and, after validating his status and other security checks, I would ask him what should I do in this situation, And, again, your questions are exceedingly silly.
First, in our day & age, you should be able to bring valid numbers, not hearsay, to support them. Please do.
Second, if a navi tells you that you can apply simple measures to reduce this attrition rate – by teaching your kids appropriately – giving them military specialties, teaching them middos and exercise, by organizing social services to support soldiers, would you refuse to do that?