Range, especially realistic combat range, is one of the most important aspects of any modern fighter jet. Range is arguably both less and more important for the United States Air Force relative to most air forces in the world. The USAF is structured for power projection, and that requires range, both to ferry aircraft around the world and to conduct deep strikes into enemy territory. Most air forces are designed for the defense of their homeland and so do not require long-range capabilities to project power beyond their borders.