The United States of America on 30 May, 2017 successfully conducted the first ever test of its defence system against an intercontinental ballistic missile (ICBM). The test was long planned. US Missile Defence Agency (MDA) stated that a ground based interceptor was launched at a California airbase and it successfully shot down a mock ballistic missile. Experts compare the exercise to hitting a bullet with another bullet. The enormous distance involved further added to the complexity of the test.