Three Navy SEALs and a Coast Guardsman participated in the No Man Left Behind Challenge around Sebago Lake on Monday to raise money for military families who have children with life-threatening illnesses to attend Camp Sunshine in Casco. The challenge included swims, road and trail races, bicycle sprints and a 4-mile paddle. So far, the team has raised $40,000 of a $125,000 goal, and hopes to raise the rest at the Meet the SEALs dinner Friday at Camp Sunshine. Camp Sunshine serves the entire family through various stages of a child’s illness and is free of charge.