I think regarding time frame for Blk 3, we are forgetting that there will be a tremendous amount of new systems, including Radar, possibly HMD-S and IRST/EOD and possibly new engine. I doubt very much that there will be tremendous structural changes with respect to the airframe as that would exacerbate the time schedule more. We need to remember, that these systems all need to be tested in prototypes to assure they meet standards and that they are married and talk well between each other. Even if the design and electronics suits are chosen today, that would still require extensive integration and testing. This is not Blk 1 to Blk 2 jump, this is a much larger undertaking where core systems are being changed and need to be integrated. I think the 2020/2021 is for induction after the above issues have been taken care of.