Later that year, during two weeks of combat trials in August, "Sheean" demonstrated that the class was comparable in the underwater warfare role to the "Los Angeles"-class nuclear-powered attack submarine . The two submarines traded roles during the exercise and were equally successful in the attacking role, despite "Olympia" being larger, more powerful, and armed with more advanced torpedoes. In 2003, a "Collins"-class boat carried out successful attacks on two USN nuclear submarines and an aircraft carrier during a multinational exercise. The repeated successes of the class in wargames and multinational exercises earned the "Collins" class praise from foreign military officers for being "a very capable and quiet submarine", and recognition of the boats as a clear example of the threat posed to navies by modern diesel submarines.