The federal government will need to hire 270,000 workers for “mission-critical” jobs over the next three years to replace retiring baby boomers, according to a study out Thursday. The government’s ambitions, which include trying to right the fallen financial sector and win two wars, among other major goals, have also increased the need for hiring. "It has to win the war for talent in order to win the multiple wars it's fighting for the American people," said the study’s author. Most in need of hiring? The medical and public-health sector.