Which of the following is NOT a type of Army Aviation formation?

The Air Assault Brigade is not classified as a type of Army Aviation formation. The primary function of an Air Assault Brigade is to conduct air assault operations, which integrate air mobility and ground forces to achieve specific tactical objectives. While Air Assault Brigades utilize aviation assets, they are primarily ground units designed for rapid deployment and engagement in combat operations rather than aviation formations themselves.

In contrast, the other options represent dedicated Army Aviation formations. A Combat Aviation Brigade is organized to provide aviation support to combat missions, including attack and support helicopters. The Expeditionary Combat Aviation Brigade is specialized for rapid deployment in diverse environments, often without the logistical footprint and support structures of more traditional brigades. The Theater Aviation Brigade serves a broader purpose in providing aviation capabilities across a specific theater of operations, coordinating and integrating aviation assets to support diverse missions.

Thus, understanding the distinction between these formations highlights the Air Assault Brigade’s primary ground mission compared to the aviation-centric focus of the other listed brigades.