The Air Force inspector general cleared a retired general after the Government Accountability Office raised concerns about his role in Lockheed Martin Corp.'s effort to win a contract for a small-diameter-bomb program.

The allegations against retired Brig. Gen. Randall K. Bigum "were not substantiated," said a June 13 memo signed by Lt. Gen. Steven R. Polk. Bigum's name was deleted in the version made available to The Washington Post, but sources confirmed his identity. They spoke on condition of anonymity because his name is officially under seal.

Bigum's role was raised after the scandal involving top Air Force procurement official Darleen A. Druyun, who admitted showing Boeing Co. preferential treatment for years before taking a position with the company. Lockheed protested the award of the bomb contract to Boeing, and during a GAO hearing on the issue Boeing said Bigum was involved in the small-bomb program both in the Air Force and at Bethesda-based Lockheed.

Bigum was the director of requirements at the Air Force's Air Combat Command while the small-bomb program was being developed and is Lockheed's vice president for strike weapons. Federal law limits the contact former government officials can have with their former agencies.

"As we said several months ago, we were confident that Lockheed Martin adhered to all rules, regulations and policies regarding the Small Diameter Bomb program," company spokesman Thomas Jurkowsky said in a written statement.