Nearly six months after it flooded into Haiti, the U.S. military will call an end to its disaster-relief mission there on or around June 1. At the height of the operation in February, some 22,000 American troops were on the ground keeping order. Since then, the number has dwindled to about 2,200. With non-government organizations taking over most of the military’s responsibilities, Lieutenant General Ken Keen was able to step down from his role as head of the joint task force on Sunday. Five hundred members of the Louisiana National Guard will arrive in the country and stay until September to continue rebuilding efforts.