Posted by John McHalePARIS AIR SHOW BLOG, 21 June 2011. F-35 Joint Strike Fighter (JSF) program leaders from the Air Force and Lockheed Martin told members of the press today at the Paris Air Show that the F-35 mission software is on track, having Block I, II, and III versions of the software developed simultaneously. Meanwhile, the helmet-mounted display, which shows the pilot all the fused sensor data the F-35 payload generate still has some technical challenges to overcome.The F-35 helmet-mounted display pushes state of the art technology and brings the full benefit of the sensor suite to the pilot in terms of how it is displayed on the screen, says Maj. Gen. C.D. Moore, deputy program executive officer, F-35 Lightning II Program Office. "We still have technical challenges to overcome" such as the night vision capability and issues with the panoramic display on the visor, he adds.The F-35 software has more than 10 million lines of code, Moore says. Block 1 software will start flight training this fall, Moore says. An upgrade to in November will add multiple levels of security to the software that will enable use by the three services and coalition partners. Block 2 is going into the F-35 test aircraft in November, while the Block 3 schedule is still being determined, but all the software will be integrated by the 2014 time frame and fully run out by 2016, Moore says.