The SPY-6 variant

レイセオンニュースから
https://www.raytheonmissilesanddefense.com/news/feature/new-eyes-fleet

フライトⅡAへのバックフィットについては、

こんなコメントも。

https://breakingdefense.com/2021/08/raytheon-navy-finish-spy-6-testing-at-wallops/

Scott Spence, who leads Raytheon’s naval radar directorate, told Breaking Defense in a July interview that the company anticipates receiving a hardware, production and sustainment contract this fall that will cover the backfitting required to install the fourth SPY-6 variant onto the Navy’s Flight IIA destroyers.