A Coast Guard Cutter Bertholf crewmember tests a fuel sample for potential contamination during flight operations while the cutter was conducting a counterdrug patrol in the Eastern Pacific Ocean, March 7, 2018. Checking for fuel contamination by spinning the sample and observing any particulate in the fuel is essential to the safety of the aircrews and reducing the risk of damage to the aircraft. U.S. Coast Guard photo by Petty Officer 1st Class Matthew S. Masaschi