The Air Force says its B-2 stealth bombers are back on active duty for the first time since one of the planes crashed in February at a base on the Pacific island of Guam.

The Air Force grounded the remaining 20 planes in late February.

Officials at the B-2 base of Whiteman Air Force Base in Missouri say the planes have been sent on about 20 flights in the past week.

Both pilots ejected safely in the Guam crash. A safety board investigation is expected to be released next month.