Saute green pepper and onion in oil in a large skillet until tender. Add garlic; cook 1 minute longer. Transfer to a large bowl; cool to room temperature.
Preheat oven to 350°. Add eggs, milk, bread, cheese, rosemary, salt and pepper to sauteed vegetables. Crumble beef and pork over mixture and mix well.
Pat into 2 greased 9x5-in. loaf pans. Combine ketchup, brown sugar and vinegar in a small bowl. Spread over tops.
Bake, uncovered, 50-55 minutes or until no pink remains and a thermometer reads 160°. Let stand 10 minutes before slicing. Freeze option: Shape meat loaves in plastic wrap-lined loaf pans; top with ketchup mixture. Cover and freeze until firm. Remove from pan and wrap securely in foil; return to freezer. Freeze up to 3 months. To use, partially thaw in refrigerator overnight. Preheat oven to 350°. Unwrap meat loaf and place in pan. Bake, uncovered, 1-1/4-1-1/2 hours, or until a thermometer reads 160°.