Two types of ALTRVs...Moving and Stationary. The stationary one encompases just your refueling track. I'm a former KC-130 Nav. We would usualy use stationary ALTRVs because our speed differential was too large to fly formation with the recievers. The moving one,...well, moves with you as you fly your route. Sounds like you were on a moving ALTRV post tank. Provided the ALTRV was planned to terminate at your base and not the tanker base, you were supposed to have priority. Howerver as was pointed out above, your traffic may have been an emergency ac, or the KC-10 may have canx the ALTRV as he left. Were you guys in standard formation?