Lampshaded: "I don't care if my soldiers die; that's their job."
An Evil Chancellor deliberately places General Bob in command of the army to kill off the soldiers loyal to the King.
The Empire teaches its officers to see their soldiers as expendable.
Exploited: Bob's enemies continually encourage his men to desert, and they're only too willing to accept the offer; after all, it's not like they could be treated any worse as PO Ws than they are as soldiers.
Defied: The Federation teaches its officers to value the lives of their troops, and to try to win with as few casualties as possible.
Discussed: "The General really doesn't care how many of his own soldiers die, as long he gets to proclaim victory at the end of the battle."
General Bob's willingness to let his army take massive casualties results in his nation running out of fighting men and costing them the war.
General Bob's callousness results in morale plummeting to rock bottom, and most of his soldiers desert or defect.
Reconstructed: General Bob's tactics, costly though they are, are demoralizing enough to the enemy that they sue for peace, preventing the war from dragging on and killing more people on both sides.