Who said "A soldier must be ready to die for those they serve."?

This quote is attributed to Grey Worm.

A soldier must be ready to die for those they serve. - Grey Worm

"A soldier must be ready to die for those they serve."

Grey Worm Courage

"I am Grey Worm. I have no name."

"Unsullied do not fear death."

"We are the dragons' soldiers."

"A soldier's duty is to obey."

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."