100+ Chinese Nationals have intentionally or “accidentally” wandered onto US military and other sensitive locations in the past few years

“ The incidents, which U.S. officials describe as a form of espionage, appear designed to test security practices at U.S. military installations and other federal sites. Officials familiar with the practice say the individuals are typically Chinese nationals pressed into service and required to report back to the Chinese government.”

https://www.wsj.com/politics/national-security/chinese-gate-crashers-at-u-s-bases-spark-espionage-concerns-cdef8187