Navy Expeditionary Combat Command
The Navy Expeditionary Combat Command (NECC) is an echelon III command of the United States Navy, which serves as the single functional command to centrally manage current and future readiness, resources, manning, training and equipping of the United States Navy's 21,000 expeditionary forces who are currently serving in every theater of operation. The NECC was established in January 2006.
Source: Wikipedia — Navy Expeditionary Combat Command (CC BY-SA 4.0)