Flying drones are a risky way to rescue wounded troops. A Ukrainian official says they're a 'lifeline of last resort.'

Source: Business Insider

Ukraine has begun using heavy-lift drones for casualty evacuation missions. Stringer/REUTERSUkrainian forces said Monday that they pulled off a "first-ever" air evacuation using a heavy drone. Deploying large aerial drones for battlefield casualty evacuation is a high-risk operation.