This one is simple, compare forward isolated green zone bases to more open community bases. The vast majority of bases aren't sealed away and isolated from the surrounding community. The article mentions Nellis Air Force Base in Nevada, a mere 12 miles from the Las Vegas strip and simply part of the community. Hopkins shows Nevada with a 13% positivity and rising. Which just means there's uncontrolled community spread, we don't know where it is within Nevada, and we're not doing enough test/trace/test cycles to identify an isolate the infection. People working at the base have family and connections within the community. They participate in activities off the base. Just like the hospital staff that's picking up infections in the community, even if the procedures on base are minimizing exposure, they're picking it up in the community.
Valentine's day, take your loved out out for a fancy COVID dinner.
St Patrick's day, off the pub for a pint and some singing.
Easter, yup we're going to be back to Easter again.