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that time 70,000 ukrainian soldiers have died. more than 1000,000 additional have been wounded -- 100,000. the war has kicked battlefield medicine into overdrive with new technology invented here in the u.s. making its way to the front lines in if ukraine. and a former u.s. military surgeon is also pitching in. jennifer griffin shares how it's contributing to saving lives in our sun special. [background sounds] >> reporter: on ukraine's front lines, # 80% of the wounds are traumatic brain injuries or amputations. on this day in june, dr. nick lie had just completed his third surgery when the air raid sirens went off. >> the air raid siren, do you need to go to the basement? >> i'm in safe place. >> reporter: every war with leads to innovation, especially in battlefield medicine. a young american nurse named florence nightingale cut her teeth during the 19th century crimean war. dr. north carolina lie's hospital is one of five in