Instead, Mr. Henen often hustles out to remote parts of the Mojave Desert to make sure the threatened desert tortoise, which can weigh 10 pounds and live to be more than 50 years old, isn't frightened by charging troops.

WSJ: An Army of Biologists Are on Nature Patrol at Military Bases

In the late 1800s, Charles Darwin argued for the protection of the tortoise, which can grow three feet high and live for two centuries.

WSJ