"Dr. Georges C. Benjamin, executive director of the American Public Health Association, said the ac-tions might be “too little, too late,” and warned that Americans opposed to vaccination might dig in and bristle at being told what to do. The American Hospital Association was cautious, warning of the possibility of “exacerbating the severe work force shortage problems that currently exist.” But Dr. William Schaffner, an infectious disease expert at Vanderbilt University, likened the vaccination re-quirements to military service in a time of war. “To date, we have relied on a volunteer army,” Dr. Schaffner said. “But particularly with the Delta variant, the enemy has been reinforced, and now a volunteer army is not sufficient. We need to institute a draft.”"