WASHINGTON (AP) — Last summer when dozens of nuclear missile officers were allegedly cheating on proficiency exams, test scores were among the lowest of the year, according to Air Force records obtained by The Associated Press.

That is the opposite of what might be expected if answers were being shared as widely as officials allege. No explanation is obvious, and the Air Force is not saying why test results were not better if, as alleged, at least 40 officers were cheating.

The case is still under official investigation.

The AP reviewed all test scores for 2013 for the unit in question — the 341st Missile Wing at Malmstrom Air Force Base in Montana. It found relatively weak scores during August and September, the period of alleged cheating.

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