Dan
Not convinced about the relative nos of P and D vs boom which will probably change with the type of act chosen to replace F16 anyway; not only that but flexibility and planning in a NATO or coalition mission are infrequent partners.On the last regime change effort in 2011 we even had P and D rx unable to take fuel from certain P and D tankers (and I don't mean the BDA either) . The only way to have true flexibility is to have both systems on the same tanker -pity we got that one wrong with Voyager, it is also a pity the RAF has a tanker that can't refuel one of its own rx!