Actually, it is speculated that the US provided Yemen with those same FLIR systems in 2009 that it now uses to shoot down US F-15s and MQ-9s!
"There is a distinct possibility that
the United States might have supplied the FLIR Systems turret the Yemenis claimed to have employed during this shoot down. In July 2009, the Defense Security Cooperation Agency, the Pentagon’s main arms broker, approved a so-called Pseudo-Foreign Military Sales, or Pseudo-FMS, deal that included three Ultra 8500 turrets “or equivalent,” as well as other equipment and contractor support.
The full package, intended as an upgrade for Yemen’s Huey II helicopters, had an estimated value of more than $3.7 million.
The Ultra 8500s by themselves were worth more than $600,000 apiece."
https://www.thedrive.com/the-war-zo...-flir-video-showing-shoot-down-of-saudi-f-15s