Vicksburg, Miss… The U. S. Army Corps of Engineers Vicksburg District announces the selection of Lynniese Cosey-Mayfield as Chief of the Contracting Office. Cosey-Mayfield has over 26 years of extensive contracting experience which included previous positions with the Aviation Systems Command in St. Louis, Missouri, the National Institutes of Health and the Food and Drug Administration, both in Washington, D.C. She came to the Vicksburg District in 2002 as a contracting team leader and later served as a branch chief.