KONA, Hawaii -- Lt. Col. Greg Schumacher, a orthopedic surgeon (left), from the 3rd Medical Group, Elmendorf AIr Force Base, performs a fracture stabilization procedure by inserting a steel pin in the leg of a mannequin. Senior Airmen Wallace Cleveland, a 3 rd EMED surgical technician (right) assists. The mock surgery was part of an exercise evaluation performed on a patient during a mass casualty exercise at the Kona International Airport, Kona, Hawaii, Feb. 4. The Airman are two of more than 900 Department of Defense personnel participating in Pacific Lifeline, a total force humanitarian assistance and disaster relief exercise taking place from three locations within the Hawaiian Islands through Feb. 9. Led by 13th Air Force, Pacific Lifeline provides an integrated team of Air Force and Army active-duty, Air National Guard and Reserve Component forces a training environment to test their abilities to respond to and support humanitarian and natural disaster relief operations within the Pacific Region. (U.S. Air Force photo/Tech. Sgt. Tom Czerwinski)