Another thing that would make politiicans think twice before committing to a war is if we didn't have a spearate Departments of Veterans Affairs and Defense. If wehad only the department of defense, and forced it to keep its old, retired, wounded, crippled ex-soldiers on their books as vets, then the Defense Department itself would be VERY leery of committing to a fight, and that would translate into the JCS' counseling Presidents against comitting to any fight.
If DoD had to shoulder the burden of caring for wounded/disabled (instead of sloughing them off to another Department (VA)) then DoD would think twice before counseling the politicians about going to war.