The Army is introducing a new formation to its modular brigade structure designed to carry out security force assistance missions, according to service officials. Eight brigades have been tapped for special training to become the Army's first "advise and assist brigades," Lt. Gen. William Caldwell, commander of the Combined Arms Center at Ft. Leavenworth, KS, told an audience at the Brookings Institution in Washington on March 27. "We have taken one -- we have modular brigades in the United States...