Bipartisan lawmakers question the decision to refocus the 173rd Airborne Brigade's drone unit as the military weighs how quickly to adapt to modern warfare. WASHINGTON — A bipartisan group of lawmakers is asking the U.S. Army to explain why it is moving to end a specialized drone unit within the 173rd Airborne Brigade, arguing that the decision could limit the military's ability to learn from rapidly changing battlefield technology. The lawmakers' concerns come as drones have