Who said "When the going gets tough, that's when you prove yourself."?

This quote is attributed to War Machine.

When the going gets tough, that's when you prove yourself. - War Machine

"When the going gets tough, that's when you prove yourself."

War Machine Courage

"Next time, maybe you'll listen when I tell you something."

"I'm a soldier. That's what I do."

"You think you're the only one with something to prove?"

"I follow orders. That's the difference between us."

"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."