"I have more gratitude than I could ever express for what this career has taught me and for what it has allowed me to be part of," McNab wrote in the Facebook post. "The job is more about problem solving than about enforcing rules, despite what it appears to be.
I’ve met incredible people and I’ve seen true heroics and unselfish acts far more than I’ve seen the bad side of human nature. Despite the feeling to the contrary, the world is full of goodness if we can only recognize it when we see it."