He still maintained his active rank of major in the USAAF and worked out of Montfichet Field in Essex, which is located halfway between London and Cambridge. Montfichet Field is one of the very few WWII-era aerodromes to have survived to the present day, although clearly not in its original layout. It's presently known as Stansted Airport, and it's a busy modern facility used primarily by locals for travel within the British Isles and to / from the European continent, as well as air freight carriers such as UPS and its European counterparts.

We've only learned the extent of my grandfather's wartime intelligence activities in England since August 2008, some 12 years after his passing, when most all OSS personnel files were fully declassified by the National Archives. My uncle and I were curious about what he actually did, since he never liked to talk about it to his wife or children (or was perhaps forbidden from doing so by federal law), so we filed an FOIA application and checked it out.

Well, much to our disappointment, it was hardly James Bond-style work. It actually consisted mostly of humdrum rote duty, traveling an assigned circuit between various USAAF bases in East Anglia and central England, debriefing local English law enforcement officials on a regular basis regarding any suspicious activities occurring nearby those facilities, and then reporting his findings to his superiors in London. Boring! (Then again, serving in wartime England was no doubt way more exciting than being stuck for three years at a large but remote airfield near Taft, CA.)

But when considered in total, this cloak and dagger business is rather fascinating stuff. But how successful (or otherwise) any of it really is, we're likely to never know in our own lifetimes, except through the occasional leaks.

In reality, there are several possibilities to consider:

This is an official North Korean military operation. We know that North Korea has extensive cyberattack capabilities.

There is a reason that was the first option.  You have been on a paranoid tear from the first day of this.   The screed about "how many other CEO can just call the president"  was hardly believable.  Even for you.
The president made a strong statement because the timing of the two announcements - that the movie was pulled and the NKs were behind it - left the impression they were related.  I even remarked on it in a comment.   He clearly wanted to make it clear they were not connected.
Look
I really don't care what you believe.  But the fact is it looks like it was NK.  And it's not the first time they have done this.  Or even the second.  Which supplies some of the reasons for naming them.  Their finger prints are all over it.  Could it possibly NOT be them.  Sure, I suppose.  But the president, just like the rest of us, is trying t figure out who did it.
Why on earth would Obama or anyone else want or for that matter need to "make NK into a bad guy"