Near the end of the Vietnam War, Lynn Seiser lined up with other fresh-faced Army recruits to await a dreaded, often bloody ritual.
Along with millions of other members of the military, Seiser, then 21, received his service vaccines not by way of disposable syringes but with needleless “jet guns” that blasted drugs into each arm using puffs of high pressure. The U.S. military at the time touted the medical device for its ability to immunize veterans en masse, cheaply and safely.
