Which of the following is not a type of service award?

The Achievement Medal is recognized primarily for individual accomplishments and performance rather than for overall service or participation in specific campaigns or activities, which characterizes the other awards listed. Service awards are typically designed to acknowledge extended service, participation in particular operations, or exemplary performance in a unit context.

A Campaign Medal signifies participation in a specific military campaign, recognizing the service rendered during that time. A Unit Citation is awarded to recognize outstanding service by a unit, and it acknowledges collective accomplishments. The Distinguished Service Medal is conferred for exceptionally meritorious service in a duty of great responsibility, emphasizing an individual's influential contributions.

In contrast, the Achievement Medal focuses on the recognition of personal achievements, making it distinct from other awards that are more aligned with service commitment or group efforts. This differentiation clarifies why the Achievement Medal is categorized differently from the types of service awards listed.