Uniindia: Visakhapatnam, Nov 20(UNI) Naval helicopter deployed for the Rescue and Relief Operations at Kadapa District undertook air droping of 3600 kgs of relief material including 6000 ready-to-food packets and 6600 water bottles to marooned groups of people in six different locations between Annamaya and Nandallur in close coordination with the District Officials on Saturday.