Tate Landin was 23 and training for his first deployment with the U.S. Army when he began to notice his brain tumor symptoms.

“About once a month I would smell this sharp, metallic scent and my arms would tingle,” Tate says. He would later learn the brief episodes were symptoms of a left temporal lobe brain tumor, but at the time, he was diagnosed with anxiety attacks and cleared for duty. 

Tate deployed to Afghanistan...