0176 – Victorinox Classic SD (Vice President of the United States)

This is a 58mm black Classic SD with on the front side the signature of (then Vice President) Joe Biden, and on the back side the seal of the Vice President of the United States.

external links: SAK Wiki

0156 – Victorinox Classic SD (US Air Force – Air Training Command)

This is a blue 58mm Classic SD with on one side a metal inlaid emblem of the US Air Force, and on the other side a metal inlaid emblem of the Air Training Command.

external links: SAK Wiki