CHEYENNE, WYO. (AP) — The nation's land-based nuclear force commander says changes are being made in the wake of a cheating scandal at Malmstrom Air Force Base in Montana.

Dozens of missile launch officers have been implicated in cheating on the monthly test on their knowledge of how to operate the missiles.

Maj. Gen. Jack Weinstein leads the 20th Air Force, which responsible for 450 intercontinental ballistic missiles in Wyoming, Montana and North Dakota.

Weinstein says a number of reforms are underway at the three bases. Previously, airmen needed to score 90 percent or better on the tests to keep their certification. Now, the air force is moving to a pass/fail system that Weinstein says he hopes will relieve pressure on the airmen who aim for perfect scores.