https://www.navytimes.com/news/your-navy/2020/11/12/guided-missile-cruiser-antietam-wraps-up-260-day-deployment/

For the bulk of the deployment, the Antietam sailed alongside the aircraft carrier Ronald Reagan from May to October and was involved in operations in the South China Sea, East China Sea and Indian Ocean. Additionally, the Antietam was involved in dual-carrier exercises conducted with the Reagan and the aircraft carrier Nimitz and its strike group this summer.

Likewise, it was one of multiple Navy vessels participating in the Valiant Shield exercise in the Philippine Sea in September and was involved in sinking the decommissioned guided-missile frigate Curts off the coast of Guam. The vessel also completed a Tomahawk Land Attack Missile strike scenario during the exercise.