One was a senior leader on what’s probably the best Air Force football team ever. The other coached both of Navy’s Heisman winners and led the Mids to a de facto national title game in 1963. Not much in common, except another chance at enshrinement in the College Football Hall of Fame. Air Force’s Scott Thomas and Navy’s Wayne Hardin are back on the hall’s ballot, which was announced Feb. 28. Thomas appeared for the first time in 2011, and Hardin has been on since at least 2006. Once a candidate clears the nomination process (here’s the lofty criteria; non-All-Americans…