It is hard to find a more divisive topic in the aerospace world than the Lockheed Martin F-35. Aviation Week Pentagon Editor Lara Seligman sat down with two industry veterans who hold opposite views on the fighter: Marine Corps Lt. Col. (ret.) Dave Berke, a former Top Gun instructor, has flown the F-35, F-22, F-16 and F-18; and Pierre Sprey, of “Fighter Mafia” fame, helped conceptualize designs for the A-10 and F-16. Excerpts follow. Listen to their debate in full.