Chuck Mawhinney, a Marine Corps veteran who became the deadliest sniper in that branch’s history during the Vietnam War with 103 confirmed and 216 probable kills, has died at age 75. Mawhinney attended sniper scout school and was deployed to Vietnam in 1968, where he primarily used a Remington M40 rifle from 300-1,000 yards away. One legendary engagement saw Mawhinney kill 16 enemy soldiers crossing a river in a single volley of headshots on Valentine’s Day 1969, intimidating the rest to withdraw.