Don Bartletti / Los Angeles Times
U.S. Marine Lance Cpl. Darryl Charles, 22, participates in a yoga class at the Naval Medical Center in San Diego, CA on June 10. He lost his right leg above the knee after he stepped on an IED in Afghanistan in October 2011. Other veterans with PTSD or traumatic brain injuries sit on the floor as instructor Barbara Lyon conducts the one-hour class designed to calm the mind, increase flexibility and improve physical strength.