sentences:  It was again active from 1993 to 1994 as the 457th Operations Group, controlling Air Mobility Command's air refueling operations at Altus Air Force Base, Oklahoma.The 457th was converted to provisional status in 2001.The 447th Bombardment Group was activated at Geiger Field, Washington on 1 July 1943 with the 748th, 749th, 750th and 751st Bombardment Squadrons assigned.