Mary Lane Poe, biologist, Natural Resources and Environmental Affairs, tracks released desert tortoises using directional antennas and receivers at Sand Hill training area aboard Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., April 5, 2017. The release of 50 juvenile tortoise from the Tortoise Research and Captive Rearing Site occurred in March. The program was designed to find effective ways to increase the population of the tortoises on and around the installation as well as solve potential problems that wild tortoises face today. (U.S. Marine Corps photo by Lance Cpl. Dave Flores) - Mary Lane Poe, biologist, Natural Resources and Environmental Affairs, tracks released desert tortoises using directional antennas and receivers at Sand Hill training area aboard Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., April 5, 2017. The release of 50 juvenile tortoise from the Tortoise Research and Captive Rearing Site occurred in March. The program was designed to find effective ways to increase the population of the tortoises on and around the installation as well as solve potential problems that wild tortoises face today. (U.S. Marine Corps photo by Lance Cpl. Dave Flores)