Heat oven to 350°F. In 10-inch skillet, cook ground beef over medium-high heat 5 to 7 minutes, stirring frequently, until thoroughly cooked; drain.
Meanwhile, heat taco shells as directed on box.
Stir sloppy joe sauce, bell pepper and corn into ground beef. Cook 2 to 3 minutes longer, stirring occasionally, until mixture is hot and bubbly.
Spoon about 1/4 cup beef mixture into each warm taco shell; top with olives, lettuce and cheese.