C-32B looks like its got KC-135 TOPCAT3 supporting it.
TOPCAT is likely supporting the AFSOC C-32B that is following it and has dropped off ADS-B.
>7673043
Boeing C-32B
United States Air Force Special Operations Command (AFSOC) operates a small number of Boeing C-32B passenger jet aircraft, providing global airlift for U.S. government crisis response activities. These may include U.S. State Department Foreign Emergency Support Teams (FEST), which deploy in response to terrorism incidents around the world. They may also fly in support of CIA Special Activities.
http://www.americanspecialops.com/usaf-special-operations/aircraft/boeing-c-32b/