They don't want to have to make costly structural changes to the wings, and the air flow affects of the larger diameter engine shroud have had affects on cruise missile launches out on the hard...
Don't forget about the POTUS's new planes and helicopters in the works!
What I want to know is: Is NASA still on track with it's #1 goal appointed to them by Obama, that is, to make friends with Muslims? LOL !
Well Hell, at least it hasn't killed anyone yet, let's hope the navy gets the bugs out before anymore of our aging F/A-18's kill any more of our Navy pilots.
Thanks Pat, that is the way I understood it is well, but, did not know they where planning a redesign and an additional HE tank to return to super-cooling the Helium in the future.