My old passport is expired and my wife has never had a passport, so I had to look this up. Fortunately, the US State Department has a pretty good website for it. There are rules of course, especially for first-timers or expired passport holders. You’ll have to fill out a DS11 application form and bring to one of the 7000 facilities — mostly post offices — around the country. A photographer’s guide is worth looking at for those considering taking their own photos, as the State Department cares greatly for the lighting, composition, and quality of those photos. They even have special instructions for those submitting prints from digital sources.