From CBS news article:
CBS News correspondent Byron Pitts met [Sgt. Carmelo Rodriguez III] two months ago. That once-buff physique had been whittled down to less than 80 pounds in 18 months by stage 4 melanoma. He was surrounded by family, including his 7-year-old son holding his hand...
When Sgt. Rodriguez was in Iraq, military doctors, he says, misdiagnosed his skin cancer. They called it "a wart."
Eight minutes after Pitts met Sgt. Carmelo Rodriguez, and CBS News was preparing to interview him, he died.
Byron Pitts piece.
According to a veterans group that tracks soldiers who are misdiagnosed, there are hundreds of misdiagnosed cases across the country.