FEMA has asked the Pentagon to ready as many as 10,000 troops to support 100 COVID-19 vaccination sites nationwide, with the goal of administering 450,000 vaccinations a day. The federal government envisions 50 "mega" vaccination sites capable of administering 6,000 shots per day, in addition to 50 "large" vaccination sites providing 3,000 shots per day, according to defense officials. The first of the FEMA-powered vaccination sites are expected to be operating by mid-February…