RANIER, Wash. (AP) -- Joint Base Lewis-McChord has released the
names of the four Army aviators killed when two helicopters crashed
during training at the Washington Army base.

They are Captain Anne M. Montgomery, a native of North Dakota;
Chief Warrant Officer Frank A. Buoniconti, a native of Colorado;
Chief Warrant Officer Joseph S. Satterfield, a native of Alaska;
and Chief Warrant Officer Lucas Daniel Sigfrid, a native of
Alabama.

An investigation into the cause of the accident by a team from
Fort Rucker, Alabama, began Wednesday.

Lieutenant Colonel Gary Dangerfield says the investigation could take as long as a year.

The two-seat reconnaissance choppers crashed after 8 p.m. Monday in the southwest training area of the sprawling base, killing all four on board.