Anwar Johnson and Andrew Henke scored 14 points each as Air Force dealt Colorado State its 13th consecutive loss with a 61-59 victory in Fort Collins.
Marcus Walker scored 18 points for Colorado State, which is winless in the Mountain West.
Late in the game, Henke made two free throws to give Air Force the lead, 59-57.
The Rams had a chance to tie or take the lead on their next two possessions, but Walker made 1-of-2 free throws and then turned the ball over.
Air Force gave the ball right back when Keith Maren missed the front end of a 1-and-1, but Walker missed wildly with 12.7 seconds left. Johnson sealed the game with two free throws that made it 61-58.