Seems to be tied to the activation of 'Space Systems Command'. Interesting stuff.
"Upon the activation of Space Systems Command, the 45th Space Wing will transfer over from Space Operations Command and be renamed Space Launch Delta 45."
"Announced as part of the U.S. Space Force's structure on 30 June 2020, Space Systems Command is intended to centralize military space research, development, acquisitions, and launch activities in a single command. The SSC intendeds to bring Army and Navy space acquisition activities under it as well."