During Clark’s early days of serving in the US Marine Corps, he learned never to excuse any behavior. If a task was not completed or was done incorrectly, instead of a normal response trying to shi...view moreDuring Clark’s early days of serving in the US Marine Corps, he learned never to excuse any behavior. If a task was not completed or was done incorrectly, instead of a normal response trying to shift blame onto someone or something else, he was required to take ownership, and the only verbal response allowed was, “No excuse, sir.”view less