Alvin Mar, a systems engineer for Lockheed-Martin, tests a UHF satellite communications antenna in preparation for a journey to the Arctic Circle aboard the Coast Guard Cutter Healy in Seward, Alaska, Aug. 6, 2014. The Healy is a 420-foot icebreaker that makes regular trips to the polar regions for scientific missions. (U.S. Coast Guard photo by Petty Officer 1st Class Shawn Eggert)