On the F4 in the first picture, there is a span-wise doubler-strap under the wing. Is that an original design feature or a life-extending mod?
These straps were added as F-4s went through scheduled maintenance as i understand it, there were also doubler plates added around the wing fold area and, most RAF F-4s actually received completely new build outer wing sections late in their operational lives.
-RP
oops, Ivor Toolbox beat me too it!