Because after my first year I had a lot of success, took everybody by storm, came back the next year thought it was easy and didn't have near the season I had the previous year. It was kind of a wake-up call. And so, life goes on.
That's driven by any number of factors, the most prominent of which have been the combat experience of two major campaigns - one in Afghanistan and the other in Iraq - and the ongoing demands of the global war on terrorism.