WASHINGTON (AP) — Relatives of some of the 30 U.S. troops killed when their helicopter was shot down in Afghanistan said congressional testimony from U.S. military officials on Thursday answered some, but not all, of their lingering questions about the single deadliest incident of the war.

Garry Reid, principal deputy assistant secretary of defense for special operations and low-intensity conflict, told the House Committee on Oversight and Government Reform that the Chinook CH-47, a lumbering transport helicopter, was the proper aircraft for the high-risk mission targeting a senior Taliban commander in the early morning hours of Aug. 6, 2011, in eastern Afghanistan.