That interrogation has come to be one of the subtle highlights of the movie for me, because it's one of the few instances where it fills in the blanks of Indy's life since Last Crusade without sounding obviously expository. I like the thought of Indy having fought in WWII and gone on a bunch of missions for the U.S. as a spy or whatever. I'd expect nothing less of him- he hates Nazis, after all. It's a cool, effortless way of assuring me that Indy has indeed stayed a badass since we last went on the road with him.