Petty Officer 3rd Class Kristopher Krysa, left, 27, from La Grange Park, Ill., a corpsman with Security Force Assistance Advisor Team 2-215, teaches a course on treating casualties aboard Forward Operating Base Nolay, Helmand province, Afghanistan, Jan. 28, 2014. Krysa offers classes to anyone interested in casualty care and provides Marines with physical therapy programs and physical training exercises.