Official USMC 1st Marine Division #5214890
Description
The 1st Marine Division is a Marine infantry division of the United States Marine Corps headquartered at Marine Corps Base California. It is a subordinate unit of the I Marine Expeditionary Force (1 MEF) It is the oldest and largest active duty division in the United States Marine Corps, representing a combat-ready force of more than 19,000 men and women. It is one of three active duty divisions in the Marine Corps today and is a multi-role, expeditionary ground combat force. It is nicknamed "The Old Breed". The division is employed as the ground combat element (GCE) of the I Marine Expeditionary Force or may provide task-organized forces for assault operations and such operations as may be directed. The 1st Marine Division must be able to provide the ground amphibious forcible entry capability to the naval expeditionary force (NEF) and to conduct subsequent land operations in any operational environment.
Written by the group; not a statement by this register.
Membership history
Growth
Growth history is still building. We hold one measurement for this entry. A trend needs at least two, taken days apart — so this will fill in on its own rather than being estimated. We do not publish numbers we have not measured.
| Measured (UTC) | Members | Change |
|---|---|---|
| 14 Aug 2026, 08:04 | 1 | first reading |
Ownership
Owned by @vox990 as measured.
Members we’ve seen
@vox990 — O10 Chairman of the Joint Chief of Staff (rank 255)
A sample — only members this register has independently measured, highest rank first. Not the full roster.
Related groups
Groups whose measured members overlap with this one — a sample from our membership graph.
Open data
Download this group’s measured record — free to reuse with attribution: membership history (CSV) · full record (JSON)
Each file carries its licence and retrieval time inside it, and is generated from the same measurements shown above.