Air Combat Command has ordered the stand-down of most F-15 fighters for the second time in as many weeks due to potential airworthiness issues, Inside the Air Force has learned. The move comes less than a week after ACC stood down all F-15 A, B, C and D models for longeron issues. The latest stand-down stems from new findings discovered in the investigation of a Nov. 2 crash of a Missouri Air National Guard F-15C fighter that broke apart during...