I've often thought it a little cheeky how little Britain contributed to the defence and liberation of their Pacific territory. For example, Britain owned the Solomon Islands, including Guadacanal, but it was the Americans, with help from Australia who fought and died to defend and recapture it. So, considering that so much US effort is being made to defend British or CW territory, including the Solomons, PNG and Australia itself, it seems only fair that Force Z fight alongside the USN.