In keeping with its global responsibilities, ACC initiated a series of "Global Power" missions in 1993. ACC's bomber wings are required to perform out-of-CONUS training flights to demonstrate the capability to perform their "quick reaction" worldwide mission. On one of the global power missions, two B-1 Lancer aircraft of the 28th Bomb Wing, Ellsworth AFB, South Dakota, set a B-1 flying time record on the first leg of their round-the-world flight, 11–13 August 1993. The following year, two B-52s from the 2d Bomb Wing, Barksdale AFB, Louisiana, circumnavigated the globe in 47.2 hours, the longest jet aircraft flight in history.