What is the basic building block of an AETF?

The basic building block of an Air Expeditionary Task Force (AETF) is the squadron. This is because squadrons are the primary operational units within the U.S. Air Force that are specifically designed to execute air operations and can be tailored to fit different missions within an AETF structure. Each squadron is equipped with specific capabilities, whether it be combat, support, or logistics, allowing it to effectively contribute to the overall mission objectives of the AETF.

In the structure of an AETF, squadrons can be organized into groups or wings, and they typically include a range of personnel and equipment required to sustain flight operations. This modular organization allows for a flexible and responsive approach, enabling the AETF to adapt to various operational scenarios and missions.

Other potential choices like brigade, battalion, and company represent organizational units from other branches or levels of military operations, which do not align with the specific structure and functions of an AETF, solidifying the squadron as the correct answer.