Coast Guard Aids-to-Navigation Team San Francisco members Petty Officer 1st Class Jesse Jarvis and Fireman Arman Purganan throw a buoy overboard and tie it off to the 26-foot trailerable ATON boat in Lake Tahoe, Sept. 9, 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)