After Operation Harpoon, the 3PPCLI returned to Kandahar International Airport, and started training for future operations. On April 18, 2002, the 3rd Battalion was involved in a highly publicized case of friendly-fire ("blue on blue"). The Canadian soldiers were participating in planned nighttime training exercises near Kandahar when Major Harry Schmidt, an American pilot from the Illinois Air National Guard, flew overhead. Believing he was being fired upon by enemy soldiers, Schmidt dropped one laser-guided bomb on the soldiers from his F-16. Sergeant Marc Léger, Corporal Ainsworth Dyer, Private Richard Green and Private Nathan Smith were killed instantly and eight were injured. Schmidt was court-martialed by the U.S. and convicted of dereliction of duty as a result, in what became known as the Tarnak Farm incident.