NYPD Officer Steven Mayfield adjusts his CPAP machine, which

UNITED STATES - JULY 13: NYPD Officer Steven Mayfield adjusts his CPAP machine, which is used in the treatment of sleep apnea, at his home on W. 130th St. in Harlem. Mayfield logged more than 400 hours at Ground Zero at the perimeter of what became known as The Pile immediately after the Sept. 11 World Trade Center tragedy. He now suffers from sarcoidosis, a disease that scars the tissue of the lungs; shortness of breath; chronic sinusitis, and sleep apnea. "My lungs are damaged; they will never be the same," says Mayfield, 44. (Photo by Craig Warga/NY Daily News Archive via Getty Images)