The BLM says the donkeys are attracted by natural springs of water in the area.
A fort official says training is halted each time the burros roam through live-fire areas.
They also impact the habitat of the threatened desert tortoise.
The BLM plans to remove the donkeys beginning in late August. There have been two previous roundups. The BLM says burros are popular, so finding homes for them should be no problem.
