Jack Lucas, who at 14 lied his way into military service during World War II and became the youngest Marine to receive the Medal of Honor, died Thursday in a Hattiesburg, Miss., hospital. He was 80.

Lucas had been battling cancer. Ponda Lee at Moore Funeral Service said the funeral home was told he died before dawn.

Jacklyn "Jack" Lucas was just six days past his 17th birthday in February 1945 when his heroism at Iwo Jima earned him the nation's highest military honor. He used his body to shield three fellow squad members from two grenades, and was nearly killed when one exploded.