I'm not a sub expert by any stretch of the imagination, so it's not for me to say what it is the military needs. The comment that has been made by many practitioners is that overall NATO and NATO allies have let their antisubmarine warfare capabilities atrophy, as a function of the different types of conflicts that are out there; perhaps now is the time to reconsider whether that kind of training needs to be looked at again.
On November 22nd, 2017. See this statement in context.