When Sgt. Michael Nowacki of the Chicago Police SWAT Team had a day off this past weekend, he needed to find something to do. His longtime girlfriend, Officer Erin Gubala, was busy working the finish line of the Hot Chocolate 15K as part of Chicago Police’s bike patrol unit. Nowacki, an avid runner since he joined the Army in 1990, decided he might as well run the race, and represent his department while doing so—by completing it in his SWAT gear. An experienced marathoner with 11 Chicago Marathons under his belt, a 15K wouldn’t be that bad. The gear aspect,...