1. Cut the pork tenderloin into 1-inch chunks. Sprinkle the pork with rosemary.
2. String the pork and squash, alternating, onto four skewers, wrapping each piece of pork with a piece of bacon as you pierce it onto the skewer.
3. Preheat your grill to medium-high. Grill the kebabs until the pork and bacon are cooked through, turning often. Serve immediately.