Which of the following falls under noncombatant services?

Noncombatant services are activities that support military operations without engaging directly in combat. Logistical support behind the front lines is a prime example of noncombatant services, as it includes the provision of supplies, transportation, and various support functions that ensure troops can operate effectively. This type of work is essential for maintaining the military's functionality and safety without taking part in the direct act of warfare.

In contrast, combat operations, medical support in a war zone, and ground combat responsibilities all involve active engagement in combat situations or direct involvement in military fighting. While medical support is vital and can occur in high-risk areas, it is often considered a form of combat support rather than a noncombatant role, as medical personnel may be exposed to combat conditions. Thus, logistical support stands out as the correct embodiment of noncombatant services.