I spoke with a family member of mine who recently retired from VAFB and dealt specifically with missile launches. He said he hadn't heard any details but usually when a launch is terminated like that it's because it's veered off course.
Also, a combined Space Ops Center just opened up over there.
https://www.keyt.com/news/-stronger-together-vafb-dedicates-combined-space-operations-center/770029780