It wasn't immediately clear whether the additional 30-plus airmen suspected of being involved in cheating on proficiency tests are alleged to have participated in the cheating directly or were involved indirectly.
The officials spoke on condition of anonymity because they were not authorized to disclose the information by name while the investigation is ongoing.
The Air Force announced on January 15 that while it was investigating possible criminal drug use by some airmen, it discovered that one missile officer at Malmstrom Air Force Base in Montana had shared test questions with 16 other officers. It said another 17 admitted to knowing about this cheating but did not report it.
The tests in question are designed to ensure proficiency by launch officers in handling "emergency war orders," which involve the classified processing of orders received through their chain of command to launch a missile. These written tests are in addition to two other types of monthly testing on the missile system and on launch codes.
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An Air Force spokesman, Lt Col Brett Ashworth, said the Air Force would not discuss details of the cheating investigation, including any change in the number of suspects, until the probe is completed.
The Air Force's top general, Mark Welsh, has said the removal of 34 missile launch officers at one time appeared to be the largest such action in the history of the missile force. He said there is "absolutely no excuse" for cheating. Malmstrom is home to the 341st Missile Wing, which operates, maintains and provides security for 150 nuclear-armed Minuteman 3 intercontinental ballistic missiles. This represents one-third of the entire ICBM force.