Site na 1935, US Forest Service si ọkụ management iwu kwuru na niile ọkụ ọhịa ga-emenyụ site 10 ụtụtụ ụtụtụ mgbe ha na-mbụ hụrụ. Early U.S. Forest Service ọrụ e guzobere nile ọha ala, na n'ozuzu staffed site na-eto eto ndị ikom n'oge ọkụ oge. Site na 1940, firefighters mara dị ka anwụrụ ọkụjumpers ga parachute si ụgbọelu imenyụ ọkụ na n'ime ime obodo ebe. Site na mmalite nke Agha Ụwa nke Abụọ, ihe karịrị 8,000 ọkụ lookout elu e wuru na United States.
Smokey Bear