U.S. Navy Master Chief Petty Officer Christopher Aldis, center, the command master chief of the 2nd Marine Aircraft Wing, congratulates Seaman Kyle Peterson, second from right, a casualty evacuation corpsman with Marine Aircraft Group 40, Marine Expeditionary Brigade-Afghanistan, after Peterson received the Navy and Marine Corps Achievement Medal March 5, 2010, at Camp Leatherneck, Afghanistan. Peterson was recognized for his actions during an air casualty evacuation mission in August 2009.