Final answer:
A passport is a valid form of identification for domestic flights within the US, entry into military bases, and certain federal facilities. Library cards, gym memberships, and social media profiles are not acceptable forms of ID for these purposes.
Step-by-step explanation:
When boarding a domestic flight within the United States or entering certain federal facilities and military bases, a valid passport is an acceptable form of identification. However, library cards, gym membership cards, and social media profiles are not approved forms of ID for these purposes. TSA-approved identification includes a driver's license, state photo identity card, DHS trusted traveler cards (such as Global Entry, NEXUS, SENTRI, FAST), U.S. military ID (when traveling on official orders), and permanent resident cards, among other options.
It's essential for travelers to carry government-issued identification that meets security standards to ensure smooth and secure access to these locations, emphasizing the importance of adhering to specified forms of identification for various official purposes.