Final answer:
An Expeditionary Task Force (ETF) is a military grouping that combines combat and support units, along with supplies and non-unit resupply, to efficiently sustain forces during missions.
Step-by-step explanation:
A grouping of combat and expeditionary combat support (ECS) unit type codes (UTC) with company supplies and the necessary non-unit resupply and personnel needed to sustain forces is referred to as an Expeditionary Task Force (ETF). This military concept is crucial for organizing and deploying units in a way that ensures they have all the logistic and support elements needed to operate effectively during missions.
This includes both combat units and the various support units that provide services such as transportation, supply, maintenance, and medical care.