Petty Officer 1st Class Jesse Jarvis, a machinery technician at Coast Guard Aids-to-Navigation Team San Francisco, works the buoy deck aboard the 26-foot trailerable ATON boat in Emerald Bay, Lake Tahoe, Sept. 10, 2019. The Coast Guard is responsible for ensuring signs, symbols, buoys, markers, lighthouses, and regulations are 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 Brandon Giles/Released)