This article from the December 30, 1942, issue of the Fort Worth Star-Telegram shares a press photo that has been available on eBay a couple times. Camp Hale was located just north of Leadville. It sat at 9500 felt and must have been a difficult place to train (cold + high altitude .. even the USO didn’t go there). The camp was only active until 1945.

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UPDATE Posted Feb 14, 2018: Here’s the same photo with nearly the same caption on eBay. The one shown at the bottom of the post was for sale on eBay in 2015.

“1942 Press Photo Soldiers driving jeeps through snow at Camp Hale, Colorado.
This is an original press photo. Snow jeeps—Parka-clad soldiers whip howitizer-carrying jeeps through unbroken snow at Camp Hale, high in the Colorado Rockies. The pack artillery of the Camp Hale mountain troops use the rugged little jeeps to carry dismantled sections of 75 millimeter howitzers until the going is so rough that mules have to take over (United States) (Wars) (World War II) (Camp Hale, Colorado) (Mountain troops) Photo measures 9.25 x 7 inches. Photo is dated 12-23-1942.”

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Original Post May 2, 2015: “1942 WWII Parka Clad Soldiers In Jeeps Camp Hale Colorado Press Photo”