 The Navy is standardizing address formats for ships and mobile units. Take a closer look. On the first line, it's simply your name. On the second line, it's your ship or mobile unit name. On the third line, it's your six-digit unit number followed by your box number. And on the last line, it's your FPO and your zip code, five digits only. Use all capital letters and avoid punctuation so mail processing scanners can easily read the address and get your mail to you wherever you are. There's more information online.