>>550
ちなみにイギリスが(一時期)F-35BからF-35Cに切り替えたのは

http://www.cbrneportal.com/too-smart-for-our-own-good-the-f-35-and-the-b61-12/

The F-35B, instead, is particularly unfit to receive nuclear certification: having smaller internal bays
than the other two variants, it would have to carry the B61‑12s externally, which would
significantly reduce the aircraft’s stealth capabilities. For this reason, Toby Fenwick of Centre Forum has called for the conversion of British orders from
F‑35B to F‑35C, which is much similar to the F-35A and could receive B61-12 integration. 

核爆弾を内装できないから？
件のフェンウィック氏がどれだけ影響力持ってるかは知らんが