The Ground Battle Rating (BR) for the Israeli F-16I and F-15I is 13.0, whereas the US F-15E and F-16CM Block 50 are at 12.7; is there a specific reason for this difference?
I understand that the Israeli variants were placed at 13.0 due to the SPICE 250; I am curious about the distinction regarding the US variants, given that they have received the GBU-53.