Which of the following is a common required vaccination for military personnel?

Smallpox vaccination is considered a common required vaccination for military personnel because it is essential in protecting against a disease that has historically posed a significant threat during times of conflict or biological warfare. The military mandates smallpox vaccinations for certain personnel to ensure readiness and safeguard public health, particularly in the event of an outbreak or bioterrorism.

While the other vaccinations listed—shingles, tetanus, and hepatitis B—are also important for health and prevention, they are not typically mandated specifically for all military personnel in the same way as smallpox. Tetanus vaccines are often part of routine immunization schedules, but their administration can depend on specific circumstances, such as injury. Hepatitis B is important for certain roles, especially those that involve healthcare, but it is not universally required. Shingles vaccines are recommended for older adults but are not a standard requirement for military service members. Thus, smallpox vaccination remains a distinct requirement due to its relevance to military operations and potential biological threats.