India  on Thursday test-fired its nuclear-capable Agni-I strategic ballistic missile, with a range of 700 kms, as part of the Army's user trial from the  Integrated   Test Range  at  Wheeler   Island  off Orissa coast.    The indigenously developed surface-to-surface single-stage missile, powered by solid propellants, was test fired from a rail mobile launcher at about 1010 hours from launch pad-4 of the ITR, 100 kms off the Orissa coast, defence sources said. User of the missile - the Strategic Force Command (SFC) of the Indian Army - as part of their training exercise, executed the entire launch operation with the logistic support provided by the Defence Research Development Organisation (DRDO) at the ITR, said a DRDO official. The missile has a highly specialised navigation system which ensures it reaches the target with a high degree of accuracy, he said. The entire trajectory of the missile, which has an operation...