 Well, KRDO had a chance to check out what may be the toughest time of all for the U.S. Air Force Academy's Class of 2028. New cadets at the academy are being put through the paces of the second phase of their basic training. They marched more than five miles to Jack's Valley on the academy grounds. Commandant and Brigadier General Gavin Marks say they learn skills like land navigations, first aid, and how to protect themselves when attacked.