NATO’s 1999 air campaign over Kosovo represents a rare example of a purely coercive air power campaign. Most coercive air campaigns are combined with a ground element, making it difficult to empirically distinguish the specific role played by air power. In Operation Allied Force, though, the prospect of a ground campaign was discussed and no meaningful ground threat materialized. There is also little evidence that Slobodan Milosevic perceived NATO was seeking to generate a threat of invasion. Accordingly, this is an unusual case of a significant military campaign that led to a successful outcome relying on air power alone. NATO did not plan for the campaign to last as long as it did, nor were plans in place that would have guaranteed the Western alliance’s desired outcome. Nevertheless, the campaign achieved NATO’s primary goals. It thus represents an example of a purely coercive military strategy leading to a successful result.