vehicles, and also a base repair depot for repair and maintenance of its various equipment. CVRDE undertakes major research on battle tanks and other combat vehicles. MBT Arjuns, armoured ambulances, Combat Improved Ajeyas and Nag anti-tank missiles are some of the recent products from CVRDE. The Heavy Vehicles Factory produces an indigenous version of the T-72 tank known as Ajeya. HVF also produces the main battle tank Arjun. The production of T-90S Bhishma tanks started in 2006–2007. The Tamil Nadu Special Police (TSP) also has a division in Avadi, the TN 2nd and 5th Battalion. There was a World War II airfield at Red Hills, Sholavaram, approachable from the junction close to the CRPF Camp, Avadi, immediately after the Military Hospital. Manufacturing Industrial Hub Avadi is around 7 km from Ambattur Industrial Estate and 22 km from Sriperambudur - Irungattukottai Sipcot Industrial Park. Demographics According to the 2011 census, Avadi had a population of 345,996 with a sex-ratio of 970 females for every 1,000 males, well above the national average of 929. A total of 36,091 were under the age of six, constituting 18,419 males and 17,672 females. Scheduled Castes and Scheduled Tribes accounted for 16.16% and 0.63% of the population respectively. The average literacy of the city was 81.76%, compared to the national average of 72.99%. The city had a total of 87,733 households. There were a total of 127,152 workers, comprising 787 cultivators, 1,095 main agricultural labourers, 1,444 in household industries, 111,013 other workers, 12,813 marginal workers, 221 marginal cultivators, 310 marginal agricultural labourers, 449 marginal workers in household industries and 11,833 other marginal workers. As per the religious census of 2011, Avadi had 84.23% Hindus, 4.56% Muslims, 10.69% Christians, 0.07% Sikhs, 0.03% Buddhists, 0.08% Jains, 0.3% following other religions and 0.03% following no religion or did not indicate any religious preference. From 229,403 in 2001, the population of Avadi grew to 344,701 in 2011, registering a decadal population growth of 50%. Places of worship There are many Hindu temples in and around Avadi. Karumari Amman temple, Chinnamman temple, Nagavalli Amman and Perumal temple are famous temples in Avadi. Many old generation temples are also present in and around Avadi. Thirumullaivoyal, a locality near Avadi, is famous for Masilamaniswara Temple, Thirumullaivoyal, an ancient temple of Lord Shiva, as well as Pachaiamman Temple. Vaikundhanaadhar Temple is located near Kovilpathagai; Angaalamman Temple is located on the Redhills road. Sri Venkateswara