Army Chief of Staff Gen. Mark Milley has raised the possibility of splitting up the service's reserve components into some formations that are maintained at a higher state of combat readiness than others. In absorbing personnel cuts across the entire Army, "I'm going to lean heavily on the Guard," Milley said at a Dec. 14 industry conference in Washington. In return, the reserves must be prepared, for example, to increase their training days from 39 days per year. "I sit...