Looks like they will be building them in Saint Louis.
https://www.military.com/daily-news/...vy-a_210922.nl
18 Sep 2021
Associated Press | By JOHN O'CONNORSPRINGFIELD, Ill. (AP) — Chicago-based aerospace giant Boeing Co. will invest $200 million to begin manufacturing the U.S. Navy's latest unmanned aircraft at MidAmerica St. Louis Airport in a project that could add at least 150 jobs on the company's southwest Illinois campus, officials said Friday.
Boeing will build the MQ-25 Stingray, the Navy's first carrier-based unmanned aircraft in a state-of-the-art plant of about 300,000 square feet. The company has been under contract developing and testing the craft since 2018