At the height of the COVID-19 pandemic, the U.S. military launched a secret campaign to counter what it perceived as China’s growing influence in the Philippines, a nation hit especially hard by the deadly virus.

Reuters identified at least 300 accounts on X, formerly Twitter, that matched descriptions shared by former U.S. military officials familiar with the Philippines operation. Almost all were created in the summer of 2020 and centered on the slogan #Chinaangvirus – Tagalog for China is the virus.

The military program started under former President Donald Trump and continued months into Joe Biden’s presidency, Reuters found – even after alarmed social media executives warned the new administration that the Pentagon had been trafficking in COVID misinformation. The Biden White House issued an edict in spring 2021 banning the anti-vax effort, which also disparaged vaccines produced by other rivals, and the Pentagon initiated an internal review, Reuters found.