Appearances in six nations. A stop on a deployed aircraft carrier at sea. A trip to the war zone. A visit with wounded heroes. Not bad for a week’s work. But as Indianapolis Colts fans know (and Denver Broncos fans are finding out), it’s wise to expect the best when Peyton Manning gets involved. The NFL quarterback — a four-time Most Valuable Player and the MVP of Super Bowl XLI who’s on the express train to the Hall of Fame — led a delegation of athletes on a USO tour last week, beginning at Walter Reed National Military Medical Center…