Which of the following is NOT considered a passport feature?

The Visa Waiver Program is not considered a passport feature because it is a policy rather than a physical attribute or component of a passport. The Visa Waiver Program allows citizens of certain countries to travel to the United States for tourism or business for stays of 90 days or less without obtaining a visa. It does not appear on or alter the physical characteristics of a passport itself.

In contrast, features that are considered part of a passport include identification cards, travel certificates, and military ID cards, as these are credentials that can be used for identification when traveling internationally. Each of these items serves specific functions within the realm of identification and travel documentation, but the Visa Waiver Program operates independently of the structural features of a passport.