Energy Security and Lightering Independence Act of 2021 This bill authorizes an alien crewman to obtain a permit to land in the United States for up to 180 days if, during this period, the crewman will perform ship-to-ship liquid cargo transfer operations involving a vessel engaged in foreign trade. Currently, an alien crewman may obtain a permit to land for up to 29 days. Under this bill, an alien passing in transit through the United States to board a vessel to perform the above-described liquid cargo transfer operations may qualify as a nonimmigrant in transit. (A qualifying nonimmigrant in transit may obtain a transit visa.)