Not entirely true. Some will eventually have to make the ultimate sacrifice to pave the way for others to win. This is a fact of war. Unless you go and lay yourself down like an idiot in front of the enemy, the famous saying of Gen Patton has more to do with fighting smart. No Army, certainly not the PA, trains its men and officers to waste themselves. Yet the idea of self-sacrifice is encouraged as and when required. Its not an easy thing by any measure to lay your life down for an idea.
While you see slogans like the one above, you also see logical one like "sweat saves blood, blood saves life, brain saves both."