U.S. Navy Chief Petty Officer Tristan Cavender, a dive medical technician at EOD Expeditionary Support Unit 1, helps Petty Officer 1st Class Matt Kamalo, a diver at Coast Guard Regional Dive Locker Pacific, don his scuba tank before diving at the National Science Foundation’s McMurdo Station, Antarctica, Jan. 19, 2016. Coast Guard and Navy divers train at the same school, standardizing procedures and allowing for seamless integration during joint deployments. (U.S. Coast Guard photo by Petty Officer 2nd Class Grant DeVuyst)