In trying to figure out the structure of the USMC, we've found several links to other web sites to research and understand more. We would not be doing the Marine Corps justice by trying to re-define what we have learned and posting it here for all to read. That being said, let us share with you the places that we have used to learn about the USMC Structure.
Intro to Marine Corps Units This page offers definitions of those terms MAGTF, MEF, MEB, MEU, MSPF, Division, Regiment, Battalion, Company, Platoon, MAW, MAGS and Support Groups.
Marine Corps Battalion Links They have a chart where you can "see" which unit belongs to which division and there are links to each of the units which includes history and links to unit web sites.
Other Web Pages we've found useful in understanding Marine Corps Structure:
USMC Air Wing General Information addressing the air wing side of the USMC.
Weapons & Equipment Here's a new link to the USMC official web site that describes weapons and equipment used by the USMC.
www.hqmc.usmc.mil/factfile.nsf