The MechCommanders are a profession/rank within the AFFC.
They guide and command units of up to several Lances in strength. However, in contrast to all other officers, they do so from afar.
MechCommanders work at a computer console in a dropship. With a complex C3-technology, they are able to watch after every detail of their unit, like weapon and pilot status, ammunition, armor... Additionaly, they recieve intelligence from cameras attached to the Mechs, their sensors, surveillance satellites and similar means and even TV-reporting. Even though they might not be trained Mech-pilots, they are skilled in warfare and know how to best use their unit in any situation.