By Vanessa Johnston MADISON, Wisc. (Reuters) – When Joenes Gellada joined the National Guard, he never imagined that would mean one day training as a nursing assistant. “Never in my wildest dreams,” he said as he completed his two-week training course at Madison Area Technical College in Wisconsin on Friday. The COVID-19 pandemic exacerbated an existing shortage of healthcare workers with about one in five quitting since February 2020, according to a Morning Consult poll published in October. “Our healthcare workers are in desperate need of our help. They’re beyond exhausted,” said Dr. Lisa Ma…