Yes! When I did it it was necessary to show proof of international travel in the next 14 days. I had to go to Portsmouth NH because the Boston office had no appointments, otherwise pretty painless (except for the extra fee to expedite). They definitely said no walk-ins, and that’s why I skipped Boston to go to Portsmouth, but when I was there in the waiting room, they definitely were taking walk-ins… So maybe they say that just to limit it 🤷‍♂️ Mine was also a renewal versus a new passport, so not sure if that changes things…