U.S. Defense Secretary Ash Carter says the military will attempt to learn from the tragic loss of life in two incidents Thursday -- one in Texas, the other in Tennessee -- since both involved safety issues in training.

Speaking in Singapore, where he was conferring Friday with his Singaporean counterpart on Southeast Asian security issues, Carter expressed condolences to the families of those killed.

Carter said that because both incidents involved safety issues during training, the military will take actions designed to prevent such accidents once military investigations are completed.

Five soldiers were killed and four were missing after a troop carrier overturned Thursday in a rain-swollen creek at Fort Hood. In the other incident, a pilot was killed when his Blue Angels fighter jet crashed near Nashville.