Roberts had 127 yards rushing in first half, and his 2-yard touchdown run was the only score in the first half. Matthew Dapore made field goals from 30 and 32 yards for Air Force (9-3, 5-3 Mountain West Conference).
The Falcons' Jayden Goodwin picked off a Jalen Mayden pass in the end zone with 3:36 remaining. San Diego State then forced a three-and-out, but Trey Taylor stepped in front of an Aztec receiver in the end zone for an interception with 1:40 left in the game.
Air Force gained 271 of its 285 yards of offense on the ground and Haaziq Daniels threw just two passes.
Mayden was 16-of-31 passing for 188 yards with the two interceptions for San Diego State (7-5, 5-3 Mountain West Conference), which ended a three-game win streak. Jack Browning made a 26-yard field goal in the third quarter to avoid the shutout.
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