As far as I'm aware there is no such Aircraft in the USAF USMC USN.
They have KC-10 KC-135 etc but no KC-141.
The only Aircraft with 141 in its name was the C-141 Starlifter which has retired long ago and was never used as a Tanker..........
If any assets required inflight refueling they would be assisted by KC-10's or KC-135's or the Omega 707's or the RAAF KC-30.
Do you really need me to paste these links?
Lockheed C-141 Starlifter - Wikipedia, the free encyclopedia
Boeing KC-135 Stratotanker - Wikipedia, the free encyclopedia