The Army?s top procurement official, Gen. Claude M. Bolton Jr., is resigning, Army officials said. General Bolton?s resignation comes one month after an independent panel criticized how the Army oversees $4 billion a year in contracts for food, water, shelter and other supplies to sustain American forces in Iraq, Kuwait and Afghanistan. General Bolton, a retired two-star Air Force general, plans to leave on Jan. 2, after exactly six years in his current job. He is scheduled to testify before a Senate subcommittee next week on the review panel?s conclusion that the Army failed to train enough experienced contracting officers to operate in combat zones.