Thursday's Colorado State at Air Force football game has been called off because of an uptick in COVID-19 cases within the Rams program.
The Mountain West made the announcement Wednesday and declared it a no contest.
It will not be rescheduled, although the conference said it "is working with Air Force on alternative game options for this weekend."
Also Wednesday, the postponed Air Force-Army football game at Michie Stadiuim was rscheduled for Dec. 19 on Army's home field. It was moved from its customary spot on the first Saturday in November because of COVID-19 issues at Air Force.
The rescheduling keeps alive the competition between the three service academies for the Commander-in-Chief's Trophy for the 49th year. Air Force defeated Navy 40-7 to open its season in early October and a win over the Black Knights would give the Falcons the hardware for the 21st time.
The 121st Army-Navy game is set for Dec. 12, also at Michie Stadium.
Information from The Associated Press was used in this report.