At first sight, they are just cobblers, grocers, deliverymen and garbage collectors, nothing special, but in China's nascent people's war on terror, these "men in the street" are on front line, part of what President Xi Jinping called a "wall of copper and iron", a state-run Xinhua news agency report said.
The vigilante system is not new and has existed for long.
The mobilisation of the vigilantes, mostly retired men and women, went up to improve security in Beijing, which last year witnessed a major suicide attack by militants from Xinjiang at the historic Forbidden City.
Three Uygurs, the native Muslim community from Xinjiang, consisting of a mother, her son and daughter-in-law, drove an SUV at high speed to the entrance of the Forbidden City at the sprawling Tiananmen Square.
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Five people were killed and 39 injured in the attack.
Liu Yanhua, a retired factory worker and member of the people's army patrols Tiananmen Square, and reports anything suspicious.
"I question strangers whenever I meet them," he said.
His neighbourhood of 3,500 has some 150 vigilantes, most of whom are retired elderly people. When patrolling the community, they wear red waistcoats and armbands.
Although they have been trained to deal with emergencies, Liu said they will not get directly involved in any situation, but only serve as the eyes and ears of the police.
Anti-terrorism has been a mainstay in volunteer training for major global events since the 2008 Beijing Olympics.
Zhao Guoqiang has served his community as a public security volunteer for 14 years, mainly keeping an eye out for burglars, thieves and minor offenders.
Lately he has been on the lookout for terrorists.
Mei Jianming, director of the counter-terrorism research centre at the People's Public Security University of China, believes the masses play an important role in fighting terror.
With 276 subway stations security is paramount to Beijing.