Knowing the challenges of the rangers working in the west, please discuss how three of the rangers were well suited for the job (background, education, experience, special skill, and so on).

In my answer, I will discuss three rangers: Ed Pulaski, Elers Koch, and Frank Herring.
The text tells us that Pulaski was hired as an assistant ranger. He was said to be at least twenty years older than the typical ranger hired by the Forest Service. However, Pulaski had much experience living in the unforgiving wilderness; he was an expert in "carpentry, metal forging, riding, [and] route finding," skills which allowed him to survive in the Rocky Mountains. Pulaski had also worked as a "plumber, a steamfitter, a blacksmith, [and] an outfitter."
In short, Pulaski was well prepared for a ranger's job, as he was accustomed to hard labor on unforgiving terrain. Most importantly, Pulaski was a respected figure in Wallace and the surrounding Bitterroots area; this was a significant plus, as most of the local population were "none too favorably inclined towards the Forest Service."
Meanwhile, Elers Koch was raised in Montana and was familiar with life in the wild Rockies. He was also educated at the Yale School of Forestry and was one of the few rangers who were westerners, two facts favored by Gifford Pinchot (President Theodore Roosevelt's chief forester). Because of Koch's western origins, he was given charge of the Lolo, Bitterroot, and Missoula national forests after graduation. Koch had both the Ivy League education and western heritage Pinchot favored. 
The third ranger is Frank Herring. Unlike the other Ivy League-educated forest rangers, Frank was just a regular cowboy. Herring may have lacked formal education, but he had much experience living on a sparse income and thriving in challenging circumstances. Herring had worked with President Roosevelt on his ranch in the Dakotas, and he had also served as one of Teddy's Rough Riders in Cuba. In short, Herring was a tough, no-nonsense, formidable figure, capable of facing the challenge of forest fires unflinchingly.