The senior enlisted airman at Offutt Air Force Base's 55th Wing was removed from his position earlier this week, base officials acknowledged Friday. Chief Master Sgt. William Thomaston Jr. was relieved Monday after the wing commander, Col. Greg Guillot, "determined that (Thomaston) couldn't effectively perform his duties," said Delanie Stafford, a 55th Wing spokesman. Thomaston had been Guillot's principal enlisted adviser, responsible for the military readiness and well-being of more than 5,000 enlisted airmen at Offutt. Stafford described the decision as "sudden" but said he couldn't discuss details because of privacy laws.