It might be a C-17 with the winglet wing tips. Real workhorse during the Kabul fiasco.
I was tracking the 'FR 24' app and watching the air traffic for several days. Lots of USAF and reserve aircraft. That was the only time I have seen them recognize and describe a US military aircraft.
You could track the re-fuelers and recon aircraft circling areas around the base and a few MiL-24 copters wondering around.
Very cool tracking hardware out there.