The DRDO has rescheduled the test-firing of submarine launched ballistic missile ( SLBM) K-15 to January 31. It was supposed to be test-fired from an underwater platform off the Vishakhapatnam coast on January 20. "The test was first scheduled on January 16, but was postponed to January 20. Now it has again been rescheduled to January 31 due to delay in arrangements. It is a coordinated exercise of both land and Navy personnel," a source said. "India can join the league of five nations, Russia, US, France, Britain and China, with the successful launch of the K-15 missile. These countries already possess advanced missiles that can be launched from a submarine," sources said. The indigenously developed K-15 or the B-05 missile are 10 metres in length, one metre in diameter and weighs ten tonnes with a strike range of around 700 km.