christian avila tavares, an army combat medic, was on a training drill in 2018 when one vehicle brokeow it. >> wow. 1:30 a.m. maybe. it's dark. it's raining. it's muddy. the vehicle that we were towing just slid and hit us. and so we just rolled over. and i was expelled from the vehicle, and then the vehicle just landed on top of me, pinning me down from the waist down. >> so this giant monster vehicle rolls over on top of you? >> yes. on top of me. >> reporter: his left leg had to be amputated above the knee. the right leg was so badly damaged he spent the next two years in rehab learning how to walk again. >> you're killing it, bro. >> reporter: and we learned there was another rollover during training at that same place that same day as avila tavares's. the army told us there were fewer vehicle deaths last year, saying most are caused by human error and inexperience. nearly 1 in 5 enlistees join the army with no driver's license. the pentagon and marines declined our interview requests. though the new defense budget mandates several new safety provisions and aavs will no longer be