From the NY Times article:
Mr. Duong, a Marine Corps veteran of Vietnamese and Chinese heritage …(le sigh) … and he found the undercover officer. All the buzzwords. Freedom and liberty loving. Guns, of course.
According to the complaint, the authorities first learned of Mr. [Fi] Duong on the morning of Jan. 6 when he and a man they described as Associate 1 encountered an undercover Metropolitan Police Department officer near Freedom Plaza in Washington. Mr. Duong, 27, asked the officer whether he was a “patriot,” court papers say, and the officer said he was. When asked the same question, Mr. Duong, a Marine Corps veteran of Vietnamese and Chinese heritage, told the officer that he was an “operator,” prosecutors say.