[As soon as the WuJing get there, it’s over. (CCCP Secret Police, armed). Yeah, the same units that put down all those protesters in 1989.]
The People’s Armed Police are basically the equivalent of Soviet Interior Ministry MVD units. They are a combo of coup insurance (in case an army honcho gets ideas and somehow manages to corral enough support from other army chiefs to make a bid for power) and riot control.
Hmm... they mainly employed specially chosen units of illiterate thugs who were dependent and savage, upon advice of Soviets, because they thought the Police and National Guard units were not tough enough on the students. The result is these units of illiterates started shooting at the students, police and guard units.
“Regular army units were used at Tiananmen Square”
In the strict sense, China has no “Regular Army.” The People’s Liberation Army is an arm of, and answers solely to the Central Military Commission of the Chinese Communist Party. The governmental Ministry of Defense is a veneer, much like the government itself, used by the PLA to deal with foreign militaries.
They are, more or less, equivalent of the Nazi Waffen SS, on a much larger scale.