The W86 was an American thermonuclear warhead with earth-penetrating characteristics (a nuclear bunker buster), intended for use on the Pershing II IRBM missile. The W86 design was canceled in September 1980 when the Pershing II missile mission shifted from destroying hardened targets to targeting soft targets at greater range. The W85 warhead, which had been developed in parallel with the W86, was used for all production Pershing II missiles.