Final answer:
In order to wear a non-military decoration, a service member is required to wear at least one U.S. military decoration. The options provided in the question do not list the correct number, which is one.
Step-by-step explanation:
The question relates to the regulations surrounding the wear of U.S. military decorations in conjunction with non-military decorations. According to military dress code regulations, a service member must wear a minimum of one authorized U.S. military decoration in order to wear a non-military decoration on their uniform. The options provided in the question do not include the correct answer, as wearing only one U.S. military decoration satisfies the requirement for wearing a non-military award.