Lt. Col. Ian Clark, left, the commanding officer of Marine Light Attack Helicopter Squadron 369, pins the Navy and Marine Corps Achievement Medal on Sgt. Christopher Lemke during a ceremony at Camp Bastion, Afghanistan, Jan. 12. Lemke, a mechanic with the squadron, and a native of Macomb, Mich., discovered a previously unknown issue with the UH-1Y Huey helicopter that represented an extreme risk to the aircraft and aircrew. - Lt. Col. Ian Clark, left, the commanding officer of Marine Light Attack Helicopter Squadron 369, pins the Navy and Marine Corps Achievement Medal on Sgt. Christopher Lemke during a ceremony at Camp Bastion, Afghanistan, Jan. 12. Lemke, a mechanic with the squadron, and a native of Macomb, Mich., discovered a previously unknown issue with the UH-1Y Huey helicopter that represented an extreme risk to the aircraft and aircrew.