National Geographic : 1974 Dec
Fire! The chilling cry sends men hurrying to battle an enemy that can ravage as many as 24,000 acres in 24 hours. In British Columbia a helicopter experimentally bombards flames with 960 gallons of water mixed with chemical retardant (be low). A ranger descends by line (left) to extinguish a small fire set by light ning; the daring technique saves time getting to the blaze and eliminates the danger of parachuting into the dense growth. Protecting the valuable lum ber resources of the U. S. Pacific Northwest has been a federal and state effort since 1911, when rangers were first sent to the region.