The Army's top officer plans to place "bets" over the next year on new technologies that are expected to ensure the service will have the capabilities necessary to fight and win in the decades beyond the 2020s, a move that could shake up the composition of the service's roughly $7.5 billion annual research and development portfolio beginning in fiscal year 2019. Army Chief of Staff Gen. Mark Milley is homing in on potential new investment areas and his decisions will...