High Quality Content by WIKIPEDIA articles! The Indian Ballistic Missile Defense Program is an initiative to develop and deploy a multi-layered Ballistic missile defense system to protect India from missile attacks. Introduced in light of the ballistic missile threat from Pakistan, it is a two tiered system consisting of two interceptor missiles, namely the Prithvi Air Defence (PAD) missile for high altitude interception, and the Advanced Air Defence (AAD) Missile for lower altitude interception. The two-tiered shield will be able to intercept any incoming missile launched 5,000 kilometers away. PAD was tested in November 2006, followed by AAD in December 2007. With the test of the PAD missile, India became the fourth country to have successfully developed an Anti-ballistic missile system, after United States, Russia and Israel. On March 6, 2009, India again successfully tested its missile defense shield, during which an incoming "enemy" missile was intercepted at an altitude of 75 km.