The Coast Guard Cutter Polar Star undergoes extensive maintenance and repairs while at a dry dock facility in Vallejo, Calif., Oct. 3, 2018. Contractors and crewmembers are preparing the cutter for it’s upcoming Antarctic mission supporting Operation Deep Freeze, the U.S. military’s contribution to the National Science Foundation-managed U.S. Antarctic Program. Coast Guard photo by Petty Officer 1st Class Matthew S. Masaschi.