Will Conant connected on a 39-yard field goal as time expired after backup quarterback Nate Romine completed a long pass, helping Air Force upset No. 21 Colorado State 27-24 on Friday to snap the Rams' nine-game winning streak.

Fullbacks Shayne Davern and D.J. Johnson scored for Air Force (9-3, 5-3), which has now won six straight over the Rams (10-2, 6-2) at Falcon Stadium.

Romine stepped in for starter Kale Pearson, who was a late scratch with a tender right ankle. Romine ran for a score and threw for 135 yards, including a 26-yard strike to Garrett Brown to get the Falcons in field-goal range.

This after Colorado State went for it on fourth-and-short in Air Force territory, only to have Dee Hart stopped short. It gave Air Force good field position and 38 seconds left.