The Marine Corps Logistics Base at Yermo (CA) is the railhead for the Army at Ft. Irwin, which is the primary desert training center for the US Army. When Ft. Irwin was reactivated, the troops arriving were initially given equipment for their two-week training period. You can imagine how bad of a beating the equipment took for those two weeks. Now Ft. Irwin only maintains equipment for their assigned "Opposition Force". All troops arriving for training bring their own equipment - anything from Humvees to howitzers to tanks. These are switched around the base at Yermo to allow unloading, and then driven or trucked to Ft. Irwin. This takes about a week, then things are quiet at Yermo for the two week training at Ft. Irwin, then everything comes back and spends a week being loaded back up. (I saw some vehicles that drove off, but had to be loaded for home with a crane.) Ft. Hood sent the most, quite a bit from Ft. Carson, Ft. ??? in Washington, but any Army base or National Guard unit (Alaska to Maine) might send troops to Ft. Irwin.

There didn't seem to be a steady flow or size from month to month; and seemed to be hit and miss. Some of the loading/unloading (especially the end ramps for tracked equipment) is visible from the frontage road off I-15. I worked there as a "braker/switcher", track repairer and engineer there for a while back circa 2003.