Although none of the S-300 versions have fired a missile in a conflict, it is considered a very capable SAM system that poses a significant hazard even to the most advanced aircraft or other airborne targets. In April 2005, NATO had a combat exercise in France and Germany called "Trial Hammer 05" to practice Suppression of Enemy Air Defenses missions. Participating countries were pleased that the Slovak Air Force brought an S-300PMU along, providing a unique opportunity for NATO to become familiar with the system.