In 2004 on a return trip from the UK, I had an IO in Philly grill me, wanting to know WHY I went to the UK, what I did while I was there, who I spent time with, and all kinds of questions that didn't have anything to do with him, or my return home as a USC. He was using a very demanding tone, as if he was going to get all my information. I kept my answers brief and vague, because it was none of his business I'd gone to visit my fiance, and we visited friends, went to the pub, watched tv, ate too much etc. Had I met with some shady characters and plotted against the US or UK government, then maybe he needed to know.