51 MDG CC relieved from command Published March 5, 2015 51st Fighter Wing Public Affairs OSAN AIR BASE, Republic of Korea -- The 51st Medical Group Commander at Osan Air Base, Col David S. Cockrum, was relieved of command on March 5, 2015, based on information regarding fraternization and unprofessional relationships. The Air Force does not intend to release further details at this time.