Which military branch employs aircraft for troop transportation and supply delivery?

The Air Force is the military branch specifically designed to employ aircraft for various roles, including troop transportation and supply delivery. Its primary focus on aviation enables it to utilize aircraft effectively for logistics, which is essential for ensuring that troops are equipped and capable in the field.

Transport aircraft operated by the Air Force, such as the C-130 Hercules or the C-17 Globemaster, are specifically designed for carrying personnel, equipment, and supplies. These aircraft have the capability to reach remote areas and quickly deliver essential resources, which is a critical component of modern military operations.

While other branches like the Army utilize aircraft for support and the Navy employs aircraft on carriers, the Air Force has the most comprehensive and specialized role in air transportation, making it the correct answer in this context. The Coast Guard does operate aircraft, but its primary mission focuses on maritime safety and law enforcement rather than troop transportation and supply delivery in a military context.