Son Of Ares

https://www.thedrive.com/the-war-zone/34225/stealthy-son-of-ares-jet-seen-covered-in-mirrors-during-mysterious-flight-tests

https://www.thedrive.com/the-war-zone/34201/stealthily-son-of-ares-mystery-jet-appears-with-odd-markings-and-nasa-f-15-escort