Coast Guard Petty Officer 2nd Class Kelly Yost, an electrician's mate stationed at Aids to Navigation Team Puget Sound in Seattle, uses a harness and clips to descend a ladder after fixing a light, Aug. 17, 2016. The Coast Guard is responsible for ensuring this network of signs, symbols, buoys, markers, light houses, and regulations is up to date and functioning properly so recreational and commercial boaters can safely navigate the maritime environment. U.S. Coast Guard photo by Petty Officer 2nd Class Ali Flockerzi.