Which of the following is not an acceptable form of proof of age?

A birth certificate is typically not considered an acceptable form of proof of age for purchasing alcoholic beverages or entering age-restricted venues. This is primarily because a birth certificate does not include a photo or meet the identification standards required in many states and establishments. Proof of age needs to be a government-issued ID that confirms both identity and age, which a birth certificate does not fulfill effectively.

In contrast, a military ID, passport, and US driver's license are all widely accepted forms of identification because they are official documents issued by the government that include the individual's date of birth and a photo. These IDs provide a reliable way to verify both identity and age, which is crucial for ensuring compliance with legal age requirements for alcohol consumption and entry into certain venues.