Defence Minister Rajnath Singh flagged off the 51st K-9 Vajra-T gun at the Larsen and Toubro Armoured Systems Complex at Hazira, Surat. The L&T officials showed the minister the different manoeuvres of the K-9 Vajra-T, a tracked self-propelled howitzer. Mr Singh sat in the vehicle on which the gun was mounted and was driven around the Hazira complex.