When does a service member's drinking issue start to affect others?

A service member's drinking issue starts to affect others when it adversely affects job performance because this can have far-reaching impacts beyond the individual. When someone's ability to perform their duties is compromised due to drinking, it can result in safety risks, decreased unit effectiveness, and lower morale among fellow service members. Their actions can disrupt the flow of work, create tension, and lead to a breakdown of trust within the team.

While the other options may highlight certain situations—such as when people notice the behavior or when it leads to family arguments—these do not encapsulate the broader implications tied to job performance. Formal notification also doesn't address the immediate impacts on colleagues and operations. Thus, the most fitting answer focuses on the tangible effects that a drinking issue has on the member's responsibilities and the resulting consequences for those around them in the professional environment.