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The Tucson Samaritans trek back to their vehicles in late May after their final stop for the day, carrying trash and empty water jugs in the Sonoran Desert northeast of Ajo, Ariz. The Tucson Samaritans is a humanitarian aid organization founded in 2002 as a mission of Southside Presbyterian Church to prevent death and suffering along the U.S.-Mexico border. Its volunteers drop off food and water in various locations in the desert. (CNS photo/Peter Tran, Global Sisters)