Almost 22 years after it was first conceived, the Nag anti-tank guided missile will have its "final developmental flight trials" at Pokhran on July 27-28. Over 60 developmental trials of the Nag have been conducted over the years but recurring problems in the guidance systems, especially in the "imaging infra-red (IIR) sensor-based seeker", has meant the missile is still to become fully operational. For that reason the upcoming tests are anticipated with expectations. Seven missiles will be fired against static and moving targets. These tests will be followed by the "user-trials" in mid-September. The third-generation Nag missile will have a four-km strike range.