(AP) — The Air Force Academy in Colorado is conducting its fourth probe of cheating at the school since 2004.

Academy officials said Monday about 40 cadets may have copied portions of a lab report assignment.

Superintendent Lt. Gen. Michelle D. Johnson said in a statement that any cadets found guilty will be held accountable.

The disclosure follows separate investigations launched by the U.S. Air Force in January after dozens of nuclear missile officers at Malmstrom Air Force Base in Montana allegedly cheated on their launch proficiency exams.

The alleged cheating, which was disclosed by Air Force officials, was the latest in a string of nuclear missteps revealed last year by The Associated Press.