SRVL and Bring Back Weight
As I understand it there has been not a lot of if any trials of SRVL, rolling landing on the QEC class carriers, this is necessary to enable a loaded F35B to return to the ship with weapons aboard.
Let us hope that the stresses of ski jump take off and rolling landing do not necessitate the F35D, an F35B with the heavier undercarriage of the F35C....