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Rogelio Guerrero, 502d Logistics Readiness Squadron Fuels Flight quality assurance specialist, draws a diesel fuel sample for inspection at Chapman Training Annex, Joint Base San Antonio-Lackland, Texas, Jan. 6, 2026. Fuels personnel conduct visual sampling every 45 days to check for water or sediment and ensure fuel quality at service stations across JBSA. (U.S. Air Force photo by Jonathan R. Mallard)
260106-F-YD772-1192.JPG Photo By: Jonathan Mallard

JOINT BASE SAN ANTONIO, Texas - Rogelio Guerrero, 502d Logistics Readiness Squadron Fuels Flight quality assurance specialist, draws a diesel fuel sample for inspection at Chapman Training Annex, Joint Base San Antonio-Lackland, Texas, Jan. 6, 2026. Fuels personnel conduct visual sampling every 45 days to check for water or sediment and ensure fuel quality at service stations across JBSA. (U.S. Air Force photo by Jonathan R. Mallard)


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