EECOM was a department, division, or position within Starfleet's Fleet Operations Center on Earth.
In January of 2155, Starfleet officers P. Butler, L. Clark, T. Cobb, J. Eaves, R. Eyslee, G. Lopez, L. McMeikan, D. Johnson, J. Peyser, D. Takemura, and R. Sarstedt worked in (or as) EECOM. (ENT: "Demons" set artwork)