JOINT BASE LEWIS-MCCHORD, Wash.- Senior Airman Marcello Yamaguchi, left, 446th Aeromedical Evacuation Squadron medical technician, instructs Army medical personnel when to lift Army Spc. James Walden, a Soldier participating in a mass casualty exercise, Dec. 7, 2010 here. Reservists with the 446th AES trained alongside Army medical personnel during the exercise. (Courtesy photo/Ingrid Barrentine)