"...2. Given the highly confidential nature of combat system technology...it may be effectively up to the US which country [Japan, France or Germany] such technology can be transferred to.
On January 25, 2016 The Australian picked up this same US combat system influence dynamic with Greg Sheridan's "Cautious US gives Japan edge in subs":
"...Serious doubt that Washington will be willing to provide the US Navy’s most advanced combat systems to Australian submarines if they are built by Germany or France is emerging as a trump card for Japan in the three-way battle to construct the new boats.
...The German manufacturers have countered this view by pointing out that Germany is a member of NATO in good standing and that numerous German-built subs have elements of American weapons systems.
...A senior American outlined to The Australian the reasons for Washington’s preference for the Japanese Soryu submarine to be the replacement for the Collins.