Cook the bacon in a large stockpot over medium heat until it begins to crisp. Spoon off the bacon fat, except for a thin coating. Add the peppers and onion to the bacon and continue cooking, stirring frequently, until the vegetables are tender.
Add the sweet potatoes, chicken broth, and chipotles and simmer, covered, 15 minutes or until the potatoes are tender. Stir in the corn, milk, and salt; heat through.