5 Airmen promoted to Chief Master Sergeant Published Nov. 15, 2007 Minot Air Force Base Public Affairs MINOT AIR FORCE BASE, N.D. -- Congratulations to the following Team Minot Airmen promoted to the rank of Chief Master Sergeant during calendar year 2007. The Air Force promoted 416 of the 2,476 senior master sergeants considered for a 16.80 percent select rate. Last year's selection rate was 16.85 percent. The average score for those selected was 671.39 with an average time in grade and time in service of 3.04 and 23.49 years, respectively. 5th Munitions Squadron Marty Anderson Joseph Ohl 791st Missile Security Forces Squadron Roland Jones 91st Maintenance Group Brian Ballard 91st Maintenance Operations Squadron Juan Vadell