Neither. The usual outlet for someone of his background is the Warthunder forum.Someone with an employment history like that surely would have sent his images to the US government, rather than a forum like this one.
One possible reason is that he is/was a Chinese citizen living in U.S. He got fast-tracked U.S. citizenship by serving U.S. military. A lot of Chinese did that during the Iraqi/Afgahnistan occupation period, some of them even openly bragged it on internet. He did not promptly renounce his Chinese citizenship upon acquiring U.S. citizenship. This is in principle against Chinese law. The consequence can be only an inconvinience or China denying the validity of his U.S. citizenship, it all depends on if and what unfinished business the person may have in China. One serious exemple was an Chinese Uyghur acquired Canadian citizenship got arrested in China for terrorism (before he left China), China rejected any Canadian diplomatic intervention arguing that the person is only treated as Chinese as his acquisation of Canadian citizenship was not through proper legal procedure. An inconvinience example is one of my friends, who got his foreign passport "confisticated"/held by the border police and spent the next week running around to go through his procedure of cancelling civil registration. This U.S. person may be just like the later example except due to his service in U.S. military and government has to go through more loops and hoops.May or may not be relevant, but apparently a guy in Chengdu came under official scrutiny in April. He works for the US Commerce Dept and previously served in the US military. He's currently under an exit ban in Beijing.
Anyone remember particularly good photos from April?