PARIS -- Now that weight issues are largely under control, the next big challenge facing the Joint Strike Fighter program is the completion of software development, according to Air Force Brig. Gen. Charles Davis, the JSF deputy program executive officer. Excess weight has caused a one-year delay in the JSF program. The short-takeoff-and-vertical-landing version, in particular, was affected; at one point it was about 3,000 pounds overweight. The program executive officer, Rear Adm. Steven Enewold, has said he would like...